Might try checking the rear rotor's on the late model 4 wheel disk's trucks, they would be the hat style. Use them on your existing hub and spindle, just have to come up with a caliber mount. On our race car rear ends we would clamp the caliper to the rotor with air pressure to locate the caliper bracket to the rear housing. Might work to locate the bracket to your existing spindle, just remember to space the caliber off the rotor to eliminate rubbing.
