diff --git a/src/palace/manager/api/admin/controller/custom_lists.py b/src/palace/manager/api/admin/controller/custom_lists.py
index 4237432a9..fa66ba654 100644
--- a/src/palace/manager/api/admin/controller/custom_lists.py
+++ b/src/palace/manager/api/admin/controller/custom_lists.py
@@ -9,6 +9,7 @@
 from flask_babel import lazy_gettext as _
 
 from palace.manager.api.admin.controller.base import AdminPermissionsControllerMixin
+from palace.manager.api.admin.model.custom_lists import CustomListPostRequest
 from palace.manager.api.admin.problem_details import (
     ADMIN_NOT_AUTHORIZED,
     AUTO_UPDATE_CUSTOM_LIST_CANNOT_HAVE_ENTRIES,
@@ -37,28 +38,13 @@
 from palace.manager.sqlalchemy.model.licensing import LicensePool
 from palace.manager.sqlalchemy.model.work import Work
 from palace.manager.sqlalchemy.util import create, get_one
-from palace.manager.util.flask_util import CustomBaseModel, parse_multi_dict
+from palace.manager.util.flask_util import parse_multi_dict
 from palace.manager.util.problem_detail import ProblemDetail, ProblemDetailException
 
 
 class CustomListsController(
     CirculationManagerController, AdminPermissionsControllerMixin
 ):
-    class CustomListSharePostResponse(CustomBaseModel):
-        successes: int = 0
-        failures: int = 0
-
-    class CustomListPostRequest(CustomBaseModel):
-        name: str
-        id: int | None = None
-        entries: list[dict] = []
-        collections: list[int] = []
-        deletedEntries: list[dict] = []
-        # For auto updating lists
-        auto_update: bool = False
-        auto_update_query: dict | None = None
-        auto_update_facets: dict | None = None
-
     def _list_as_json(self, list: CustomList, is_owner=True) -> dict:
         """Transform a CustomList object into a response ready dict"""
         collections = []
@@ -98,7 +84,7 @@ def custom_lists(self) -> dict | ProblemDetail | Response | None:
             return dict(custom_lists=custom_lists)
 
         if flask.request.method == "POST":
-            list_ = self.CustomListPostRequest.model_validate(
+            list_ = CustomListPostRequest.model_validate(
                 parse_multi_dict(flask.request.form)
             )
             return self._create_or_update_list(
@@ -359,7 +345,7 @@ def custom_list(self, list_id: int) -> Response | dict | ProblemDetail | None:
             )
 
         elif flask.request.method == "POST":
-            list_ = self.CustomListPostRequest.model_validate(
+            list_ = CustomListPostRequest.model_validate(
                 parse_multi_dict(flask.request.form)
             )
             return self._create_or_update_list(
diff --git a/src/palace/manager/api/admin/model/custom_lists.py b/src/palace/manager/api/admin/model/custom_lists.py
new file mode 100644
index 000000000..a96230e2a
--- /dev/null
+++ b/src/palace/manager/api/admin/model/custom_lists.py
@@ -0,0 +1,20 @@
+from pydantic import NonNegativeInt
+
+from palace.manager.util.flask_util import CustomBaseModel
+
+
+class CustomListSharePostResponse(CustomBaseModel):
+    successes: int = 0
+    failures: int = 0
+
+
+class CustomListPostRequest(CustomBaseModel):
+    name: str
+    id: NonNegativeInt | None = None
+    entries: list[dict] = []
+    collections: list[int] = []
+    deletedEntries: list[dict] = []
+    # For auto updating lists
+    auto_update: bool = False
+    auto_update_query: dict | None = None
+    auto_update_facets: dict | None = None
diff --git a/tests/manager/api/admin/controller/test_custom_lists.py b/tests/manager/api/admin/controller/test_custom_lists.py
index e446b34ca..2888da6ad 100644
--- a/tests/manager/api/admin/controller/test_custom_lists.py
+++ b/tests/manager/api/admin/controller/test_custom_lists.py
@@ -8,8 +8,8 @@
 from attr import define
 from werkzeug.datastructures import ImmutableMultiDict
 
-from palace.manager.api.admin.controller.custom_lists import CustomListsController
 from palace.manager.api.admin.exceptions import AdminNotAuthorized
+from palace.manager.api.admin.model.custom_lists import CustomListPostRequest
 from palace.manager.api.admin.problem_details import (
     AUTO_UPDATE_CUSTOM_LIST_CANNOT_HAVE_ENTRIES,
     CANNOT_CHANGE_LIBRARY_FOR_CUSTOM_LIST,
@@ -132,9 +132,7 @@ def test_custom_lists_post_errors(
                     ("name", "name"),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
             )
@@ -162,9 +160,7 @@ def test_custom_lists_post_errors(
                     ("name", list.name),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
             )
@@ -186,9 +182,7 @@ def test_custom_lists_post_errors(
                     ("name", list.name),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
             )
@@ -218,9 +212,7 @@ def test_custom_lists_post_errors(
                     ("name", l1.name),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
             )
@@ -235,9 +227,7 @@ def test_custom_lists_post_errors(
                     ("collections", json.dumps([12345])),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
             )
@@ -257,9 +247,7 @@ def test_custom_lists_post_errors(
                     ("collections", json.dumps([])),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
             pytest.raises(
                 AdminNotAuthorized,
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists,
@@ -279,9 +267,7 @@ def test_custom_lists_post_collection_with_wrong_library(
                     ("collections", json.dumps([collection.id])),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
             )
@@ -307,9 +293,7 @@ def test_custom_lists_create(self, admin_librarian_fixture: AdminLibrarianFixtur
                     ("collections", json.dumps([collection.id])),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
 
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
@@ -343,9 +327,7 @@ def test_custom_lists_create(self, admin_librarian_fixture: AdminLibrarianFixtur
                     ("auto_update", "True"),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
 
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
@@ -378,9 +360,7 @@ def test_custom_lists_create(self, admin_librarian_fixture: AdminLibrarianFixtur
                     ("auto_update_facets", json.dumps({})),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
 
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
@@ -410,9 +390,7 @@ def test_custom_lists_create(self, admin_librarian_fixture: AdminLibrarianFixtur
                     ("auto_update_facets", json.dumps({})),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
 
             response = (
                 admin_librarian_fixture.manager.admin_custom_lists_controller.custom_lists()
@@ -640,9 +618,7 @@ def test_custom_list_edit(self, admin_librarian_fixture: AdminLibrarianFixture):
                     ("collections", json.dumps([c.id for c in new_collections])),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
 
             assert isinstance(list.id, int)
             response = admin_librarian_fixture.manager.admin_custom_lists_controller.custom_list(
@@ -678,9 +654,7 @@ def test_custom_list_edit(self, admin_librarian_fixture: AdminLibrarianFixture):
                     ("auto_update_facets", json.dumps(update_facets)),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
 
             response = admin_librarian_fixture.manager.admin_custom_lists_controller.custom_list(
                 list.id
@@ -704,9 +678,7 @@ def test_custom_list_edit(self, admin_librarian_fixture: AdminLibrarianFixture):
                     ("collections", json.dumps([c.id for c in new_collections])),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
 
             pytest.raises(
                 AdminNotAuthorized,
@@ -736,9 +708,7 @@ def test_custom_list_auto_update_cases(
                     ("auto_update_query", None),
                 ]
             )
-            add_request_context(
-                flask.request, CustomListsController.CustomListPostRequest, form=form
-            )
+            add_request_context(flask.request, CustomListPostRequest, form=form)
 
             response = admin_librarian_fixture.manager.admin_custom_lists_controller.custom_list(
                 list.id