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.
0491478 231070 Ring MW
NOTE:
(Measuring ring) For determining the shim between the outer bearing race and the countershaft circlip [Discontinued]