I have a 1951 3800, which is a pre-Bendix brakes setup (started in 1953?). However you should know that the front brake wheel cylinders are different from the rear. I did notice that when I ordered my rear wheel cylinders from Chevsofthe40s, it was actually the front cylinder but mislabeled in the catalog. I ended up ordering the rear cylinders from Jim Carters. They happen to have a better selection of the hard to find brake parts IMO that you may not find at your FLAPS.