BBP Rear Brake Backing Plates for 1972 8.75

To summarize all of this: The later model LARGE bolt pattern 7 1/4 rear backing plates will work. Sometimes you have to drill the extra hole but I've actually had some that had the 5th hole in it. The small bolt pattern 7 1/4s are not likely to work. All 8 1/4, 8 3/4 (non A body), 9 1/4 and 9 3/4 (dana) and 4 1/2 BP truck brakes should work as well. It's not a hard set of brakes to find!