WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. 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]