Neither the 3235 nor the 3135 has a physical spacer type movement holder. The 3135 has screws that go in the tab holes that are backed out to butt up against a groove. The dial and movement go in about 15° CCW past two groove cutouts, then are rotated to alignment. And the 3235 has gone back to using actual movement tabs, even on the gens. So if using a 3135 in a 3235 case, it should be able to be properly mounted by using movement tabs and screws.