dude you do not want to run bolts that long. You want a DRA H&R style spacer that bolts to the hub, and then has its own bolts to mount to the wheel.
I have a H&R 30MM DRA setup for 3 series i'm considering selling. PM me if you're interested.
I run a canadian HID kit company, if you have any questions about hid kits in canada or would like to check out our products please contact me here: http://absolutehid.ca
Hot: 2001 Estoril M Roadster
ZCP 19's michelin supersports, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt ZCP 19's michelin supersports, deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 18's w310's,
Fun: 2006 YZF-R6, black