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.
0491698 242140 Device MW
NOTE:
(Tensioning device) For removal and installation of the snap ring before the centering plate on ZF transmissions [Discontinued]