WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. 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]