A while back there was a discussion about the center retaining pin and its apparent absence from certain later models. Another person was working on his brakes and found no provisions for their attachment.
None were on Ol' Roy when I disassembled the brakes and there is no evidence that they ever existed. No stubs of welds or rusty pieces or anything like that on any of the 4 backing plates.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)