Dont break it; its probably part of the overall wiring harness and pieces are NOT sold separately.

Get in there with a mirror and flashilight and figure out how the clips holding it on work. You probably squeeze it at a certain point to spread the clips enough to pull off. Here a photo of the end of the GP.

http://catalog.worldpac.com/mercedesshop/sophio/image.jsp?title=Glow%20Plug&url=http%3A//img.eautopartscatalog.com/live/F110062530BOS.JPG

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)