WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.
0491977 315060 Bolt MW
NOTE:
(Drive pin) For radial gears in the front axle differential for checking the coefficient of friction [Discontinued]