Junkyard swaps: Rear brake options for 8 1/4 and 8 3/4 axles.

Idk if these are exactly what you need, but at 50 bucks a piece, beats the junkyard. Appears to be "loaded"

Mopar Rear Parking Brake Backing Plate Dust Shield Assembly w/shoe New | eBay
Those are the internal drum parking brake setups for the late model Jeeps.
Thanks though.