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.
Hot: 2001 Estoril M Roadster
ZCP 19's, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's supersports, ZHP knob, UUC short shift GROM, OEM 18's w310's,
http://absolutehid.ca hid kit