10" drum 2.5" shoes on a 65 valiant??

What size rear?8 1/4 or 8 3/4?I just change brakes on 66 Dart,added10x2 1/2 brakes,(10x2 1/2 inch drums from Car Quest)with Moser bbp axels.Had to get 9
7-99 Dakota backing plates.This was on an 8 3/4,which I,m sure would also work for an 8 1/4 rear also.Hope this helps.