Set of 4 new Alpina BMW plastic wheel center caps which will fit 13" and 15" wheels. Also fits OZ, Weds, and many others. Fits Alpina wheels with part numbers:

73 21 3 611 104 13 x 6.5 Wheel

73 21 3 611 107 15 x 6 Wheel

73 21 3 611 108 15 x 7 Wheel

73 21 3 611 109 13 x 6 Wheel

The diameter of the emblems is 2 inches (50.9mm) and the diameter of the cap where it fits into the wheel hub is 60mm (2.36"). In a separate listing I have a set of 16 full chrome Alpina lug nuts to fit these wheels.