8 3/4" brake backing plates wanted 10"
A body 8 3/4 rears with the factory small bolt pattern wheels have a different offset than other 8 3/4 rears. If you are going to big bolt pattern axles (aftermarket or B/C/E body) you need the B/C/E/Truck 8 3/4 backing plates. If you are using stock a body axles you need A body 8 3/4 backing plates.
NOW..what is it that you need?