[69_hafton]

Despite only wanting to replace wheel cylinders, you went with 5 lug rotors in the front, I'm guessing you'd want to do the same in the rear? If so, you're looking at aftermarket axles with the rear you've got, and at this point would be better off with a 71-72 rear coil spring 12 bolt axle, IMHO. Note: I don't know what a '73 rear would involve.