Thanks Mike! The mounting holes were close but still not in the right spots to fit the backing plate. The biggest difference I could tell was that they didn't have the holes on the inside so you could connect the two cylinders together with the short line that runs behind the brake shoe mechanism.
Thanks for the other advice, too. But I've never had any luck with trying to do the brake cylinder kit thing. I wasted a lot on money when I did my '39's brakes so I learned a lesson and now when I redo brakes I chuck everything and buy new. As Barry Weeks says, there are two kinds of guys -- Mechanics and Parts Changers. I'm a Parts Changer.
Regards,
John
