DoctorDiff sells them. Not cheap, but powder coated and all new hardware.
Mopar 10 x 2 1/2" Drum Brake Assembly
Or used from here, they’re a good seller, I’ve used them before for brake parts
10 x 2.5 BRAKE BACKING PLATES REAR DRUM MOPAR DODGE 8 3/4 8.75 1965 1973 A B E | eBay
