i need to know if the front and rear wheel studs are different sizes because i need long studs to mount my pro-stars. i know they are 1/2 x 20 x 3" threads but i need to know the press in knurl diameter. Summit has two different sizes from moser, 0.615" knurl and 0.685" knurl. is that for front and rear or is the front and rear the same size. thanks for your help.