WARNING: This page is about a different car, the 2009 Mercedes-Benz E550 and 2008 Mercedes-Benz E550. However, it is still accessible from the selected car via links, so may be relevant.
FAG 35/Set B
MODEL 164, 211, 219, 251
Use:
Box wrench bit E 18, with square socket 14x18mm, for bolted connection on rear mounting of rear axle center assembly.