I have a 72 challenger that i am switching the rear brakes from 10 inch brakes to what i thought would be 11x3 inch brakes.
I found that the backing plates are for 11x2 and the drums I have are for 11x3.
The 8 3/4 rear will eventually be swapped out so for now I need to find drums.
The parts houses these days can't find anything unless they know the application.
My question is, what Mopar uses the 11x2 brakes so I can buy some drums.
Thanks.

I got my 11x3s off a 75 B body cop car or a 77 Dodge Royal Monaco, cant recall for sure.

I have 2.5" backing plates and wanted to reduce the bias, so I changed to 2" pads to reduce lock-up.
Look up 1968 Plymouth Fury on RockAuto

IIRC a lot of the early trucks D100 65-71 had 11x2 brakes and most full size vehicles from 65-74.

Yep, ordered mine for a 69 D100 truck.

Some '65-'75 C-bodies have 11" X 2" rear brakes, drums are Raybestos 2955R.

I've '67 b-body 11x3 up front, 11x2 1/2 in back.