Tire Rack does sell a stud conversion kit for the M2.
Black lugs -
http://www.tirerack.com/accessories/...B&ID=209&a=FW5
or
Polar light lugs -
http://www.tirerack.com/accessories/...5&ID=210&a=FW5
* Note – because of the M14 thread, the nuts now have a 19mm head and requires a 19mm socket.
Cannot do a 17mm socket on M14 thread.
** BMW switched to M14 hardware for a reason => clamping force.
*** All of the our Tire Rack test cars have this stud kit on them.
Please let me know if I can help further.
Thanks!!