10 inch Brake Backing Plates - Simple Source?

http://www.doctordiff.com/mopar-10-x-2-1-2-drum-brake-assembly.html

It seems as though you can use Dodge Dakota 10x2.5" rear brakes because my friend's 8 3/4 he bought had the guts for a 1997 dakota in them so we had to use those shoes. Once we bought the shoes (the parking brake strut is different), they went right on. Might be worth a shot. You'd just need the outer drum for something like a 74 Duster.