diff --git a/multi-arch-builders/README.md b/multi-arch-builders/README.md
index d44e1d10a..b75720f2f 100644
--- a/multi-arch-builders/README.md
+++ b/multi-arch-builders/README.md
@@ -127,13 +127,10 @@ ibmcloud plugin install infrastructure-service
 ibmcloud login --sso
 ```
 
-Create the Ignition config in a separate terminal and copy it into the
-container where ibmcloud is running:
+Grab the Butane config:
 
 ```bash
-cat builder-common.bu | butane --pretty --strict > builder-common.ign
-cat coreos-s390x-builder.bu | butane --pretty --strict --files-dir=. > coreos-s390x-builder.ign
-podman cp coreos-s390x-builder.ign ibmcloud:/root/coreos-s390x-builder.ign
+curl -O https://github.com/coreos/fedora-coreos-pipeline/raw/refs/heads/main/multi-arch-builders/coreos-s390x-builder.bu
 ```
 
 We've occasionally seen some failures and/or capacity issues so we'll
@@ -165,7 +162,7 @@ NAME="coreos-s390x-builder-$(date +%Y%m%d)"
 PROFILE='bz2-8x32'
 ibmcloud is instance-create $NAME $VPC $ZONE $PROFILE $SUBNET --output json --image-id $IMAGE \
      --boot-volume '{"name": "my-boot-vol-1", "volume": {"capacity": 200, "profile": {"name": "general-purpose"}}}' \
-     --sgs $SG --user-data @coreos-s390x-builder.ign > out.json
+     --sgs $SG --user-data @coreos-s390x-builder.bu > out.json
 ```
 
 
diff --git a/multi-arch-builders/coreos-s390x-builder.bu b/multi-arch-builders/coreos-s390x-builder.bu
index d690a02a9..0323ece57 100644
--- a/multi-arch-builders/coreos-s390x-builder.bu
+++ b/multi-arch-builders/coreos-s390x-builder.bu
@@ -1,6 +1,6 @@
 # This butane config will do the following:
 #
-# - Merge in the builder-common.ign Ignition file
+# - Merge in the builder-common.bu Butane file
 # - Allow the builder user to log in with the associated ssh key
 # - Set a hostname
 #
@@ -8,8 +8,7 @@ variant: fcos
 version: 1.4.0
 ignition:
   config:
-    merge:
-      - local: builder-common.ign
+      - source: https://github.com/coreos/fedora-coreos-pipeline/raw/refs/heads/main/multi-arch-builders/builder-common.bu
 passwd:
   users:
     - name: builder
diff --git a/multi-arch-builders/coreos-s390x-rhcos-builder.bu b/multi-arch-builders/coreos-s390x-rhcos-builder.bu
index c091eafb3..53ba56894 100644
--- a/multi-arch-builders/coreos-s390x-rhcos-builder.bu
+++ b/multi-arch-builders/coreos-s390x-rhcos-builder.bu
@@ -1,7 +1,7 @@
 # This butane config will do the following:
 #
-# - Merge in the coreos-s390x-builder.ign Ignition file
-# - Merge in the builder-splunk.ign Ignition file
+# - Merge in the coreos-s390x-builder.bu Butane file
+# - Merge in the builder-splunk.bu Butane file
 # - Enable the Secure Execution Host
 # - Create and initialize the secex-data volume
 # - Enable the Cex hardware based luks encryption
@@ -10,9 +10,8 @@ variant: fcos
 version: 1.4.0
 ignition:
   config:
-    merge:
-      - local: coreos-s390x-builder.ign
-      - local: builder-splunk.ign
+      - source: https://github.com/coreos/fedora-coreos-pipeline/raw/refs/heads/main/multi-arch-builders/coreos-s390x-builder.bu
+      - source: https://github.com/coreos/fedora-coreos-pipeline/raw/refs/heads/main/multi-arch-builders/builder-splunk.bu
 kernel_arguments:
   should_exist:
     # enables Secure Execution Host
@@ -111,4 +110,4 @@ storage:
       group:
         name: root
       contents:
-        local: create-cex-device.sh
\ No newline at end of file
+        source: https://github.com/coreos/fedora-coreos-pipeline/raw/refs/heads/main/multi-arch-builders/create-cex-device.sh