17-0006 Adapter
WARNING: This page is about a different car, the 2011 BMW X6 and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.
0491390 170006 Adapter MW
Replaced by: 83300493108
NOTE:
(Adapter) For screw-on radiator caps (sawtooth thread) / Replaces 06/97 with 17 0 007 / Reason: Expansion tank cover design change [Replaced]
Courtesy of BMW OF NORTH AMERICA, INC.