diff --git a/fast/stages/00-bootstrap/organization.tf b/fast/stages/00-bootstrap/organization.tf
index ea2e4cef..689f378b 100644
--- a/fast/stages/00-bootstrap/organization.tf
+++ b/fast/stages/00-bootstrap/organization.tf
@@ -147,12 +147,12 @@ module "organization" {
   iam_additive = local.iam_additive
   custom_roles = {
     # this is needed for use in additive IAM bindings, to avoid conflicts
-    "organizationIamAdmin" = [
+    (var.custom_role_names.organization_iam_admin) = [
       "resourcemanager.organizations.get",
       "resourcemanager.organizations.getIamPolicy",
       "resourcemanager.organizations.setIamPolicy"
     ]
-    "serviceProjectNetworkAdmin" = [
+    (var.custom_role_names.service_project_network_admin) = [
       "compute.globalOperations.get",
       "compute.organizations.disableXpnResource",
       "compute.organizations.enableXpnResource",
@@ -182,7 +182,7 @@ module "organization" {
 
 resource "google_organization_iam_binding" "org_admin_delegated" {
   org_id  = var.organization.id
-  role    = module.organization.custom_role_id.organizationIamAdmin
+  role    = module.organization.custom_role_id[var.custom_role_names.organization_iam_admin]
   members = [module.automation-tf-resman-sa.iam_email]
   condition {
     title       = "automation_sa_delegated_grants"
diff --git a/fast/stages/00-bootstrap/outputs.tf b/fast/stages/00-bootstrap/outputs.tf
index d7924781..d074d91f 100644
--- a/fast/stages/00-bootstrap/outputs.tf
+++ b/fast/stages/00-bootstrap/outputs.tf
@@ -15,6 +15,10 @@
  */
 
 locals {
+  _custom_roles = {
+    for k, v in var.custom_role_names :
+    k => module.organization.custom_role_id[v]
+  }
   providers = {
     "00-bootstrap" = templatefile("${path.module}/../../assets/templates/providers.tpl", {
       bucket = module.automation-tf-bootstrap-gcs.name
@@ -31,14 +35,14 @@ locals {
     "01-resman" = jsonencode({
       automation_project_id = module.automation-project.project_id
       billing_account       = var.billing_account
-      custom_roles          = module.organization.custom_role_id
+      custom_roles          = local._custom_roles
       groups                = var.groups
       organization          = var.organization
       prefix                = var.prefix
     })
     "02-networking" = jsonencode({
       billing_account_id = var.billing_account.id
-      custom_roles       = module.organization.custom_role_id
+      custom_roles       = local._custom_roles
       organization       = var.organization
       prefix             = var.prefix
     })
diff --git a/fast/stages/00-bootstrap/variables.tf b/fast/stages/00-bootstrap/variables.tf
index 1bf0e2de..8fe53c7f 100644
--- a/fast/stages/00-bootstrap/variables.tf
+++ b/fast/stages/00-bootstrap/variables.tf
@@ -28,6 +28,14 @@ variable "bootstrap_user" {
   default     = null
 }
 
+variable "custom_role_names" {
+  description = "Names of custom roles defined at the org level."
+  type = object({
+    organization_iam_admin        = "organizationIamAdmin"
+    service_project_network_admin = "serviceProjectNetworkAdmin"
+  })
+}
+
 variable "groups" {
   # https://cloud.google.com/docs/enterprise/setup-checklist
   description = "Group names to grant organization-level permissions."
diff --git a/fast/stages/02-networking-vpn/vpc-spoke-dev.tf b/fast/stages/02-networking-vpn/vpc-spoke-dev.tf
index 9b3c0f9e..4a3f0f25 100644
--- a/fast/stages/02-networking-vpn/vpc-spoke-dev.tf
+++ b/fast/stages/02-networking-vpn/vpc-spoke-dev.tf
@@ -40,7 +40,7 @@ module "dev-spoke-project" {
   metric_scopes = [module.landing-project.project_id]
   iam = {
     "roles/dns.admin" = [var.project_factory_sa.dev]
-    (var.custom_roles.serviceProjectNetworkAdmin) = [
+    (var.custom_roles.service_project_network_admin) = [
       var.project_factory_sa.prod
     ]
   }
diff --git a/fast/stages/02-networking-vpn/vpc-spoke-prod.tf b/fast/stages/02-networking-vpn/vpc-spoke-prod.tf
index 7f42ab2c..3be90c2e 100644
--- a/fast/stages/02-networking-vpn/vpc-spoke-prod.tf
+++ b/fast/stages/02-networking-vpn/vpc-spoke-prod.tf
@@ -40,7 +40,7 @@ module "prod-spoke-project" {
   metric_scopes = [module.landing-project.project_id]
   iam = {
     "roles/dns.admin" = [var.project_factory_sa.prod]
-    (var.custom_roles.serviceProjectNetworkAdmin) = [
+    (var.custom_roles.service_project_network_admin) = [
       var.project_factory_sa.prod
     ]
   }