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) With protective insert 31 3 128 - model series: E46 Discontinuation and replaced by 31 3 350 (0 493 560)