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.
0491511 231320 Holder MW
NOTE:
(Counter support) For releasing and tightening the nut on the output flange with vibration absorber [discontinued]