Rick, thanks, that is it!
http://www.peachparts.com/shopforum/diesel-discussion/390175-95-e300d-moulding-below-windshield-windshield-wiper-rubber-seal-snaps-into.html
I'm going to order one soon. This is for my '95 sedan, with cabin filter. I can cut the piece in the middle to make it fit around my monowiper if needed. On my car, I had a replacement windshield installed and the plastic channel was junk from the start. It is a Pilkington windshield, which is now an OE supplier to MB, but they failed on this one. Now the replacement glass is cracking and chipped, too thin and weak compared to factory glass. I junked an '87 sedan last year and removed the factory windshield, and it looks like it will fit my '95 sedan just fine, but I was missing this critical piece to make the installation "perfect".