I believe these were 17x8 with 5.5” backspace. ‘73-‘76 spindle and UCA and Cordoba rotors. These wheels are on Josh Walton’s blue ‘68 Convertible. Guy that owned it at the time had it in the body shop and we used my car to fit test the wheels and tires because we had identical suspension and brakes at the time. You have to make sure to run the shorter style Upper Ball Joint (type without a dome) to clear the wheel.