diff --git a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.1-presubmits.yaml b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.1-presubmits.yaml
index 3dabb9a335e2a..12651ed99734c 100644
--- a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.1-presubmits.yaml
+++ b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.1-presubmits.yaml
@@ -236,6 +236,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.1"
         - name: CLUSTER_TYPE
           value: aws
         - name: CONFIG_SPEC
@@ -307,6 +309,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.1"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.2-presubmits.yaml b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.2-presubmits.yaml
index 4396a4b334947..a77b51b43634e 100644
--- a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.2-presubmits.yaml
+++ b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.2-presubmits.yaml
@@ -308,6 +308,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.2"
         - name: CLUSTER_TYPE
           value: aws
         - name: CONFIG_SPEC
@@ -702,6 +704,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.2"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.3-presubmits.yaml b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.3-presubmits.yaml
index de7ed80b90881..0458e95b20faa 100644
--- a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.3-presubmits.yaml
+++ b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.3-presubmits.yaml
@@ -308,6 +308,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.3"
         - name: CLUSTER_TYPE
           value: aws
         - name: CONFIG_SPEC
@@ -579,6 +581,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.3"
         - name: CLUSTER_TYPE
           value: gcp
         - name: CONFIG_SPEC
@@ -652,6 +656,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.3"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.4-presubmits.yaml b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.4-presubmits.yaml
index 8a3fe5173a58b..d3816a7de5029 100644
--- a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.4-presubmits.yaml
+++ b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.4-presubmits.yaml
@@ -308,6 +308,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.4"
         - name: CLUSTER_TYPE
           value: aws
         - name: CONFIG_SPEC
@@ -581,6 +583,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.4"
         - name: CLUSTER_TYPE
           value: gcp
         - name: CONFIG_SPEC
@@ -654,6 +658,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.4"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.5-presubmits.yaml b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.5-presubmits.yaml
index 0c3b7d1008818..08d4830426b64 100644
--- a/ci-operator/jobs/openshift/installer/openshift-installer-release-4.5-presubmits.yaml
+++ b/ci-operator/jobs/openshift/installer/openshift-installer-release-4.5-presubmits.yaml
@@ -304,6 +304,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.5"
         - name: CLUSTER_TYPE
           value: aws
         - name: CONFIG_SPEC
@@ -575,6 +577,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.5"
         - name: CLUSTER_TYPE
           value: gcp
         - name: CONFIG_SPEC
@@ -647,6 +651,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.5"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.3-presubmits.yaml b/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.3-presubmits.yaml
index e5402d6e0db6f..d0f606691adf4 100644
--- a/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.3-presubmits.yaml
+++ b/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.3-presubmits.yaml
@@ -383,6 +383,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.3"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.4-presubmits.yaml b/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.4-presubmits.yaml
index 5cf5967dea1ad..ace9ebbb1c345 100644
--- a/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.4-presubmits.yaml
+++ b/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.4-presubmits.yaml
@@ -382,6 +382,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.4"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.5-presubmits.yaml b/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.5-presubmits.yaml
index 8f78ef42713e6..36c5c38d961a3 100644
--- a/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.5-presubmits.yaml
+++ b/ci-operator/jobs/openshift/machine-config-operator/openshift-machine-config-operator-release-4.5-presubmits.yaml
@@ -378,6 +378,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.5"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.1-presubmits.yaml b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.1-presubmits.yaml
index 1aee137a6e014..ebdf1004677ef 100644
--- a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.1-presubmits.yaml
+++ b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.1-presubmits.yaml
@@ -561,6 +561,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.1"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
@@ -730,6 +732,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.1"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.2-presubmits.yaml b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.2-presubmits.yaml
index 1150565ab3a07..bd42bb2806a6e 100644
--- a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.2-presubmits.yaml
+++ b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.2-presubmits.yaml
@@ -871,6 +871,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.2"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
@@ -1040,6 +1042,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.2"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.3-presubmits.yaml b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.3-presubmits.yaml
index f49bbdfae1384..a605dc1572e43 100644
--- a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.3-presubmits.yaml
+++ b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.3-presubmits.yaml
@@ -873,6 +873,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.3"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
@@ -1042,6 +1044,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.3"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.4-presubmits.yaml b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.4-presubmits.yaml
index c7748771aee92..d530e4143d5a5 100644
--- a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.4-presubmits.yaml
+++ b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.4-presubmits.yaml
@@ -875,6 +875,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.4"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
@@ -995,6 +997,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.4"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.5-presubmits.yaml b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.5-presubmits.yaml
index a125fb57f226a..c0278a34b9b2c 100644
--- a/ci-operator/jobs/openshift/origin/openshift-origin-release-4.5-presubmits.yaml
+++ b/ci-operator/jobs/openshift/origin/openshift-origin-release-4.5-presubmits.yaml
@@ -868,6 +868,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.5"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
@@ -988,6 +990,8 @@ presubmits:
         command:
         - ci-operator
         env:
+        - name: BRANCH
+          value: "4.5"
         - name: CLUSTER_TYPE
           value: vsphere
         - name: CONFIG_SPEC
diff --git a/ci-operator/templates/openshift/installer/cluster-launch-installer-upi-e2e.yaml b/ci-operator/templates/openshift/installer/cluster-launch-installer-upi-e2e.yaml
index 2c7886a8b8528..330da8c2dc491 100644
--- a/ci-operator/templates/openshift/installer/cluster-launch-installer-upi-e2e.yaml
+++ b/ci-operator/templates/openshift/installer/cluster-launch-installer-upi-e2e.yaml
@@ -2,6 +2,7 @@ kind: Template
 apiVersion: template.openshift.io/v1
 
 parameters:
+- name: BRANCH
 - name: JOB_NAME_SAFE
   required: true
 - name: JOB_NAME_HASH
@@ -1265,7 +1266,13 @@ objects:
 
         # begin bootstrapping
         if [[ "${CLUSTER_TYPE}" == "aws" ]]; then
-          RHCOS_AMI=ami-014ce8846db8b463d # FIXME: assumes AWS_REGION is us-east-1
+          case "${BRANCH}" in  # FIXME: assumes AWS_REGION is us-east-1
+          4.1) RHCOS_AMI=ami-046fe691f52a953f9;;
+          4.2) RHCOS_AMI=ami-01e7fdcb66157b224;;
+          4.3) RHCOS_AMI=ami-014ce8846db8b463d;;
+          *) RHCOS_AMI=ami-014ce8846db8b463d;;
+          esac
+          echo "RHCOS AMI: ${RHCOS_AMI}"
 
           # FIXME: get epel-release or otherwise add awscli to our UPI image
           export PATH="${HOME}/.local/bin:${PATH}"
@@ -1504,6 +1511,10 @@ objects:
           for INDEX in 0 1 2
           do
             SUBNET="PRIVATE_SUBNET_${INDEX}"
+            case "${BRANCH}" in
+            4.1) SUBNET_KEY=WorkerSubnet;;
+            *) SUBNET_KEY=Subnet;;
+            esac
             aws cloudformation create-stack \
               --stack-name "${CLUSTER_NAME}-compute-${INDEX}" \
               --template-body "$(cat "/var/lib/openshift-install/upi/${CLUSTER_TYPE}/cloudformation/06_cluster_worker_node.yaml")" \
@@ -1511,7 +1522,7 @@ objects:
               --parameters \
                 ParameterKey=InfrastructureName,ParameterValue="${INFRA_ID}" \
                 ParameterKey=RhcosAmi,ParameterValue="${RHCOS_AMI}" \
-                ParameterKey=Subnet,ParameterValue="${!SUBNET}" \
+                ParameterKey="${SUBNET_KEY},ParameterValue=${!SUBNET}" \
                 ParameterKey=WorkerSecurityGroupId,ParameterValue="${WORKER_SECURITY_GROUP}" \
                 ParameterKey=IgnitionLocation,ParameterValue="https://api-int.${CLUSTER_NAME}.${base_domain}:22623/config/worker" \
                 ParameterKey=CertificateAuthorities,ParameterValue="${IGNITION_CA}" \
diff --git a/ci-operator/templates/openshift/installer/cluster-launch-installer-upi-src.yaml b/ci-operator/templates/openshift/installer/cluster-launch-installer-upi-src.yaml
index a50677c743842..5acaf4f306a86 100644
--- a/ci-operator/templates/openshift/installer/cluster-launch-installer-upi-src.yaml
+++ b/ci-operator/templates/openshift/installer/cluster-launch-installer-upi-src.yaml
@@ -2,6 +2,7 @@ kind: Template
 apiVersion: template.openshift.io/v1
 
 parameters:
+- name: BRANCH
 - name: JOB_NAME_SAFE
   required: true
 - name: JOB_NAME_HASH
@@ -575,7 +576,13 @@ objects:
 
         # begin bootstrapping
         if [[ "${CLUSTER_TYPE}" == "aws" ]]; then
-          RHCOS_AMI=ami-014ce8846db8b463d  # FIXME: assumes AWS_REGION is us-east-1
+          case "${BRANCH}" in  # FIXME: assumes AWS_REGION is us-east-1
+          4.1) RHCOS_AMI=ami-046fe691f52a953f9;;
+          4.2) RHCOS_AMI=ami-01e7fdcb66157b224;;
+          4.3) RHCOS_AMI=ami-014ce8846db8b463d;;
+          *) RHCOS_AMI=ami-014ce8846db8b463d;;
+          esac
+          echo "RHCOS AMI: ${RHCOS_AMI}"
 
           # FIXME: get epel-release or otherwise add awscli to our UPI image
           export PATH="${HOME}/.local/bin:${PATH}"
@@ -721,6 +728,10 @@ objects:
           for INDEX in 0 1 2
           do
             SUBNET="PRIVATE_SUBNET_${INDEX}"
+            case "${BRANCH}" in
+            4.1) SUBNET_KEY=WorkerSubnet;;
+            *) SUBNET_KEY=Subnet;;
+            esac
             aws cloudformation create-stack \
               --stack-name "${CLUSTER_NAME}-compute-${INDEX}" \
               --template-body "$(cat "/var/lib/openshift-install/upi/${CLUSTER_TYPE}/cloudformation/06_cluster_worker_node.yaml")" \
@@ -728,7 +739,7 @@ objects:
               --parameters \
                 ParameterKey=InfrastructureName,ParameterValue="${INFRA_ID}" \
                 ParameterKey=RhcosAmi,ParameterValue="${RHCOS_AMI}" \
-                ParameterKey=Subnet,ParameterValue="${!SUBNET}" \
+                ParameterKey="${SUBNET_KEY},ParameterValue=${!SUBNET}" \
                 ParameterKey=WorkerSecurityGroupId,ParameterValue="${WORKER_SECURITY_GROUP}" \
                 ParameterKey=IgnitionLocation,ParameterValue="https://api-int.${CLUSTER_NAME}.${base_domain}:22623/config/worker" \
                 ParameterKey=CertificateAuthorities,ParameterValue="${IGNITION_CA}" \