Which rear brakes for a 9" housing? Explorer or Camaro?

Looking to go with a Moser rear 9" but the price for their brakes are steep. I can geet what ever housing end I want. So the Ford Explorer brakes look tempting and so do the 93 up rear Camaro discs. I need these to fit behind 15" ralleys. Which is the better choice?

Or I have a set of 80s Cadilac rear calipers rebuilt and ready to go. I even have backing plates for them but they use the smaller rotor than the 79 Z28 and Firebird. I have seen brake backing plates on E-bay but was unsure how well they work.

Give me some feed back?

All those calipers have different sized pistons. Pick whichever caliper and rotor combo best matches your choice of front brakes and your intended usage... unless it's just for looks, then pick the one that looks best.

My fronts are GM off a B body with 12" rotors single piston pretty stock stuff. Usage is mostly street with some track time for the summer planned. It stops well now and I have thought about keeping the drums and having the 9" with GM ends but it still has the Ford style bearing. Moser said I would have to grind or bore the backing plate out to clear the bearing but not much. It has a dual resivoir master cyl with a dual diaphram booster and adj prop valve.

I guess it all depends on what your using the car for. I installed a Moser 9" in my 70' and used the original drum brakes. I was able to retain the parking brake system and steel brake lines. Even the bigger 1/2" wheel studs work with stock wheels. Only modification was to remove about 3/16" from the backing plate in order to clear the big Ford axle bearing. Works fine on the strip!