Before 1951 the trucks used “Huck” style brake shoes. In 1951 they changed to more modern “Bendix” type brakes. They mount differently, use different springs and parts and are not interchangeable without changing the backing plates and other minor modifications. Bendix shoes are 2 inches wide, while the Huck shoes are only 1 3/4 inches wide. I think the brake cylinders vary in bore as well as having right/left differences with Bendix. Huck replacement parts are getting scarce and more expensive, but are perfectly adequate for a stock truck if you have your shoes refurbished, and clean up your drums, check/replace lines, and purchase new cylinders.
