I've only had experience with the caddy caliper's and the CJ rotors, using the BC bracket. It's a bolt on swap, but the parking brake is nothing but headaches. So much so, we switched back to factory drums. Rear brakes contribute so little to stopping power, I'm not a fan of rear disc conversion. Maybe someone will comment on the Explorer rear disc. It has a dedicated parking brake system, I would think has to be better than the caddy calipers.
Mark