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.
0492471 343000 Holding sleeve MW
NOTE:
(Assembly sleeve) For inserting the piston with sleeve into the tandem brake master cylinder, dual circuit braking system [Discontinued]