The lug nut areas are about 1/2 counter-bored into the outer edge of the center hub area, this is why you need special lug nuts, which E-T supplies. I am sorry, I do not have the wheels any longer. A member here bough them, maybe he will chime in. I have converted the car to 4-wheel disc brakes, and at the same time went to 4 1/2" pattern. I bought 4 new E-T mags though, because I love the way they look.
