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:
(Adapter) For screw-on radiator caps (sawtooth thread)/Replaces 06/97 with 17 0 007/Reason: Expansion tank cover design change