Originally Posted by BaanVelgen
For some reason Bilstein has not much available for the 335xi. The only kit we can offer you is the B12 kit.
B12 kit doesn't exist for the XI.
Only thing available from Bilstein for our XI models are the B6 (HD) or B8 - you can match it with Eibach springs for something similar to a B12 kit (using B8 only, HD is for stock spring heights).