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.
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Hot: 2001 Estoril M RoadsterZCP 19's michelin supersports, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 18's w310's,
Fun: 2006 YZF-R6, black, ohlins, pazzo, cat delete, vance hines csone, YEC racing tune