WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
Note: For compressing disc spring
Transmission: 3 HP 12, 3 HP 20, 3 HP 22, 4 HP 22, 4 HP 24