diff --git a/ci/ops-files/concourse-gcp-spot.yml b/ci/ops-files/concourse-gcp-spot.yml
index 6c20c4f6d..0083373ee 100644
--- a/ci/ops-files/concourse-gcp-spot.yml
+++ b/ci/ops-files/concourse-gcp-spot.yml
@@ -8,18 +8,18 @@
 #
 # Note: Spot VMs can be preempted at any time and are recommended for
 # non-production environments only.
+#
+# This appends 'spot' to vm_extensions without removing existing extensions
+# like 'lb' which is required for load balancer configuration.
 
 - type: replace
-  path: /instance_groups/name=db/vm_extensions?
-  value:
-    - spot
+  path: /instance_groups/name=db/vm_extensions?/-
+  value: spot
 
 - type: replace
-  path: /instance_groups/name=web/vm_extensions?
-  value:
-    - spot
+  path: /instance_groups/name=web/vm_extensions?/-
+  value: spot
 
 - type: replace
-  path: /instance_groups/name=worker/vm_extensions?
-  value:
-    - spot
+  path: /instance_groups/name=worker/vm_extensions?/-
+  value: spot
diff --git a/ci/pipelines/bosh-bootloader.yml b/ci/pipelines/bosh-bootloader.yml
index 0742a8094..21af3b8a3 100644
--- a/ci/pipelines/bosh-bootloader.yml
+++ b/ci/pipelines/bosh-bootloader.yml
@@ -975,6 +975,7 @@ jobs:
       BBL_GCP_REGION: europe-north1
       BBL_ENV_NAME: bump-deployments-gcp-concourse
       BBL_STATE_DIR: bump-deployments/bbl-gcp-concourse
+      BBL_PLAN_PATCH: spot-gcp
       DELETE_TERRAFORM_PLUGINS: false
     input_mapping:
       bbl-state: relint-envs
diff --git a/ci/tasks/bbl-up-concourse/task b/ci/tasks/bbl-up-concourse/task
index d24c910b5..13d66d0a3 100755
--- a/ci/tasks/bbl-up-concourse/task
+++ b/ci/tasks/bbl-up-concourse/task
@@ -29,7 +29,16 @@ function main() {
       ${name_flag} \
       --lb-type concourse > "${root_dir}/bbl_plan.txt"
 
-    cp -r ${root_dir}/bbl-ci/plan-patches/spot-gcp .
+    # Apply plan patch if specified
+    if [ -n "${BBL_PLAN_PATCH:-}" ]; then
+      echo "Applying plan patch: ${BBL_PLAN_PATCH}"
+      if [ -d "${root_dir}/bbl-ci/plan-patches/${BBL_PLAN_PATCH}" ]; then
+        cp -r "${root_dir}/bbl-ci/plan-patches/${BBL_PLAN_PATCH}" .
+      else
+        echo "Warning: Plan patch '${BBL_PLAN_PATCH}' not found"
+        exit 1
+      fi
+    fi
 
     bbl --debug up \
       ${name_flag} \
diff --git a/ci/tasks/bbl-up-concourse/task.yml b/ci/tasks/bbl-up-concourse/task.yml
index 18276c1fd..ea3f26111 100644
--- a/ci/tasks/bbl-up-concourse/task.yml
+++ b/ci/tasks/bbl-up-concourse/task.yml
@@ -41,6 +41,7 @@ params:
   BBL_IAAS:
   BBL_ENV_NAME:
   BBL_LB_TYPE: concourse
+  BBL_PLAN_PATCH:  # Optional: Plan patch directory name (e.g., "spot-gcp", "bosh-lite-gcp")
 
   GIT_COMMIT_EMAIL: "cf-infrastructure@pivotal.io"
   GIT_COMMIT_USERNAME: "CI Infra Bot"