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.
0491975 315040 Washer MW
NOTE:
(Spring washer) For pretensioning the differential side gears when determining the installation dimension in the front axle differential [Discontinued]