I know they offer a 5x120mm 15x8 for the E30 M3, but i'm wondering if it's possible that Kosei could drill an M3 blank out for 4x100 instead of 5x120 so i can fit them to my 89 325is? Does anyone know the actual backspace of the 15x8? I have the 15x7 Koseis but they're not wide enough for serious DSP competition.