98 E300 glow plug harness
 

Replacing my glowplugs and I broke one of the electrical connectors to the glow plug. No bueno. Cannot find a replacement anywhere, called Mercedes, no luck there either. Any suggestions for a replacement? I have the wire contacting it via some simple electrical connectors, but definitely not a long term solution.

http://www.peachparts.com/shopforum/diesel-discussion/372638-special-tool-removing-glow-plug-wire-1995-e300d.html

This thread might have what you are looking for in post # 10

This is the link provided to special pliers, previously posted by another member, ( looked for the post, but didn't find it )

Glow Plug Connector Pliers B0934 - Baum Tools - | Pelican Parts