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.
0493424 230181 Ring Minimum set: Mechanical tools MW
NOTE:
(Impact ring) Discontinued, only available via complete tool [cannot be ordered individually]