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.
Group 88/Set B
MODEL 203, 211
Use:
Screwdriver insert (Torx Plus 20 IPR) for loosening and tightening bolts in outside mirror