did you have to use longer studs (pressed in studs that hold rotor on) to hold those those 1.5" ones in place? because the MC kit has new studs that hold the wheels on but not longer studs for the rotors. 
Longer studs aren't needed. Use the supplied lug nuts to bolt the spacer to the hub. Use your lug nuts & bolts the wheel to the spacer. You now have 12 studs & lug nuts per wheel.
