Rear disc Brakes on 8 3/4

I have his bracket kit and am super pleased with it and his service! My 8.75 is sitting on a homemade stand all assembled waiting to go in the wagon.

EDIT: and 14 inch Magnum 500s fit my combo which is his adapters and the 2000 base Mustang calipers/rotors - don't know about 14 inch Rallyes or steelies.