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.
0490746 111380 Holding sleeve MW
NOTE:
(Assembly sleeve) For fitting the valve stem seal, diameter 7 mm [Released]