Hey, I can sympathize about the vacuum problems. I actually bought a rebuild kit for my '82 300D and in the process of trying to rebuild it, broke the old rocker arm inside, so I just put a new pump on. I have the rest of my old vacuum pump, and a perfectly good overhaul kit purchased from Autohauz.com that I'd be willing to let go for $50 plus shipping (thats for the old pump AND rebuild kit, $30+ just for the rebuild kit)... let me know.

Paul