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.
FG 62/Set K
MODEL 171.4, 203, 209, 211, 216, 219, 221
Use:
Fastening belt for mounting radiator module on engine when performing removal work
Fig 1: Identifying Fastening Belt (211 589 05 63 00)