Being the owner of a 57 Bel Air Sport Coupe and a 56 3100 series truck, I can attest to the fact that many of the components interchange. They both have the same wheel base, use the same 3 speed manual and overdrive transmissions, and use the same driveshaft and universal joints. On some years and models the wheel bearings are the same, as are brake linings, engines, distributors, generators, starters, and numerous electrical and mechanical components. I believe in the purpose of specific sites but factual information should be able to be shared across the board.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine