WARNING: This page is about a different car, the 2018 BMW X4, 2017 BMW X4, 2016 BMW X4, and 2015 BMW X4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
(Spring retainer ring) With centering ring 31 3 331 only for series E46/Without centering ring 31 3 331 for series E31, E39 front basis/model: Z3, Z3coupe