The problem is with the offset. Offsets from around +35mm to +45mm work on the E46. The offset for teh M3 rear wheels is about +21mm or so if I remember correctly. Your best bet is to sell those wheels. Or at least sell the rears and get two more front ones.
Some people will suggest spacers to make it work, but I am biased against that.
People often ask whether they cab fit stock E46 m3 wheels on their non-M3 E46 -- the answer is, the fronts will fit, but not the rear ones.
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