bme30: the z3 springs are H&R sport for a 1.9 vert from TMS.
the THR cabs are offset like the M3's, but i can't confirm that they're the same -amount- of offset. the guys at THR are good people though, i'm sure a quick phone call would answer that question.
the wheel looks centered to me as well, but the guy doing the work on my car says it's about an inch aft of center. it is hard to tell from the pics; i'll have to wait a few months to see i guess.
i didn't use camber plates, just stock e30 top mounts.