I know all the fuss about these calipers, but they're still available remanufactured, and I have all the stuff, so I'm putting these '84 Z28 rear disc brakes on the rear of an '83 RX-7 I'm building, it's new rear axle comes from a '94 S-Blazer 4x4. In this case, I got a couple of used Bronco II left shafts. Those are 5x4.5 rather than our 5x4.75, to match the front of the RX-7 ( This '83 has had the revised '86 RX-7 IFS swapped )
So then I got on Napa online to hunt brake rotors. I found some 10.51", or was it 10.53", that should have bolted right on. Correct lug pattern, correct center bore, correct hat height. But I saw some other rotors, identical except 11.3" diameter.
I ordered them, with the idea of modifying the Z28 brake backing plates, which bolt right on to the Blazer axle that came with drums, and which double as the caliper mounting brackets.
I just got done cutting them, so next will be pics of how I fit all this together, and inside the cheapest new cast aluminum 15" wheels I could find.
I see no reason why I couldn't copy this on the rear of my '86 Camaro, or my '87 S-10 for that matter. Stay tuned for bigger brakes on the cheap.

 

Getting the rear brakes figured out, red shows where I cut to accommodate the larger diameter rotors, welding will be required.

 

Waiting on parts to arrive.

 

So here it is: For about the cost of replacing the 10.5" rotors, it now has 11.3" rotors, no need to spend hundreds. Just a cutting disc and a grinding disc for my angle grinder, $1.43 of spare steel, a few rods for my stick welder, and a little electricity, it looks better, resists fade better, and stops shorter when loaded.