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.
2297311 Screw Minimum set: Mechanical tools MW
NOTE:
Ring bolt for removing and installing the E-machine from the transmission bell housing. [Released]