8 3/4 differential with 10' brakes

Those backing plates are '66-72 A-body and SOME mid 60's B-bodies with a slant 6, 7 1/4 rear, and the narrow 10" brakes. Those are RH and LH parts too. I can get you the factory part numbers if you need it, but, those haven't been available new in like forever....Someone is bound to have a pair laying around after doing a large bolt pattern axle shaft and brake changeover.