M Sport wheels for 4 series:
18" M Double-spoke style 441 M
8JX18 ET:34
8.5JX18 ET:47
etk.cc
19" M Double-spoke style 442 M
8JX19 ET:36
8.5JX19 ET:47
etk.cc
The specification in terms of width and offsets are identical compared to F30 3 series M Sport wheels.