i like the 1993 black directional cobra wheels and i would like to put the mclaren center caps on them .the asc mclaren website says the center caps are 6" in diameter.how many inches are the cobra wheels cap diameter and will they fit?the wheels from the 1989-90 resemble the 1993 cobra wheels but are only 16 inch wheels. i would like to put the 17 in wheel on my car.