WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. 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)