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 Roadster
ZCP 19's, ZHP knob, JL 8W3
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ZCP 19's, ZHP knob, GROM, OEM 18's,