I picked up that he's running either the Moser #7900 GM/Ford housing ends or the Strange #H1143 equivalents since he has GM rear drum brake backing plates, so the Explorer brakes wouldn't be an off-the-shelf option for the OP's housing ends. Housing ends aside, I would suggest that you consider what you need or want in terms of performance, determine what you intend to run for front brakes and then buy rear brakes to match.

Tobin
KORE3