WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.
0492472 Holding 343050 sleeve MW
NOTE:
(Assembly sleeve) With 22 mm diameter to insert the piston with sleeve into the brake master cylinder [Discontinued]