Small bolt patern to big bolt patern

For the mustang rotors you will need a sleeve on the spindle where the seal rides. Due to the seal being a larger diameter. Also the inner bearing is a different number for the larger inside diameter. Otherwise it is a direct bolt on.

Using the mustang rotors is a much better choice. Why? because if you use 73 and up brakes you will have fenter to tire clearance with 6 inch wheels. The 73 brakes move the wheel out 3/8 to 1/2 inch and then add the extra 1/2 inch for the 6 inch wheel. Unless your running front runners tire size will be an issue.

One other plus with the 4 piston calipers is that they free wheel when released. The single pistons always have a drag and run hot. They also create a lot of brake dust and the whole assembly is much heavier.

All good aftermarket brakes are no less then 4 piston and at time 6.