That is the AR189 brake kit. The AR189 is the 13 inch kit for A/B/E body cars with the 1973 or newer disk knuckles.
That is a Mustang Bullitt rim, 17x8 with 5.72 backspacing. But the brake kit pushes the hub outboard by 0.70 inches so it is just the same as having a 17x8 rim with 5 inches of backspacing on a stock rotor.