diff --git a/google/partner/aistreams/v1alpha1/BUILD.bazel b/google/partner/aistreams/v1alpha1/BUILD.bazel
index 7566da72..2e39d9bb 100644
--- a/google/partner/aistreams/v1alpha1/BUILD.bazel
+++ b/google/partner/aistreams/v1alpha1/BUILD.bazel
@@ -151,54 +151,17 @@ go_gapic_assembly_pkg(
 
 ##############################################################################
 # Python
-# DO NOT OVERRIDE with autogenerated rules if NOT migrated to Python Microgen
 ##############################################################################
 load(
     "@com_google_googleapis_imports//:imports.bzl",
-    "moved_proto_library",
-    "py_grpc_library",
-    "py_proto_library",
-    py_gapic_assembly_pkg = "py_gapic_assembly_pkg_legacy",
-    py_gapic_library = "py_gapic_library_legacy",
-)
-
-moved_proto_library(
-    name = "aistreams_moved_proto",
-    srcs = [":aistreams_proto"],
-    deps = [
-        "//google/api:annotations_proto",
-        "//google/api:client_proto",
-        "//google/api:field_behavior_proto",
-        "//google/api:resource_proto",
-        "//google/longrunning:operations_proto",
-        "@com_google_protobuf//:field_mask_proto",
-        "@com_google_protobuf//:timestamp_proto",
-    ],
-)
-
-py_proto_library(
-    name = "aistreams_py_proto",
-    plugin = "@protoc_docs_plugin//:docs_plugin",
-    deps = [":aistreams_moved_proto"],
-)
-
-py_grpc_library(
-    name = "aistreams_py_grpc",
-    srcs = [":aistreams_moved_proto"],
-    deps = [":aistreams_py_proto"],
+    "py_gapic_assembly_pkg",
+    "py_gapic_library",
 )
 
 py_gapic_library(
     name = "aistreams_py_gapic",
-    src = ":aistreams_proto_with_info",
-    gapic_yaml = "aistreams_gapic.yaml",
+    srcs = [":aistreams_proto"],
     grpc_service_config = "aistreams_grpc_service_config.json",
-    package = "google.partner.aistreams.v1alpha1",
-    service_yaml = "aistreams_v1alpha1.yaml",
-    deps = [
-        ":aistreams_py_grpc",
-        ":aistreams_py_proto",
-    ],
 )
 
 # Open Source Packages
@@ -206,8 +169,6 @@ py_gapic_assembly_pkg(
     name = "partner-aistreams-v1alpha1-py",
     deps = [
         ":aistreams_py_gapic",
-        ":aistreams_py_grpc",
-        ":aistreams_py_proto",
     ],
 )