I did a google image search = "1995 Mercedes E300D glow plug wires" and found this thread.

If the below clips are the ones I did not know what they looked like.
http://www.peachparts.com/shopforum/diesel-discussion/372638-special-tool-removing-glow-plug-wire-1995-e300d.html

Is a trip to the Junk Yard out of the question?

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84 300D, 82 Volvo 244Gl Diesel