What Venom said - I got around this once by using Irwin lug nut removers (e-bay) http://www.irwin.com/tools/screw-bol...-specialty-set
They sell a bolt removal kit also (found in your local woodies / home base etc) but I think they only go up to 16mm - where BMW are nearly always 17mm (did you measure the A/F across the set you have to get an idea of size?)
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