Good luck Want that looks like one pita of a job. Why is there so much rust one yours? It looks like new down there on mine.
But after going threw my car I think it's a CA car, the vacum system diagram seems to match that of a CA car. So the first owner kept it until 1994 @80k so maybe it didn't see the salt for the first 9 years. From reading your posts, I'm having to fix as many things as you, these old MB are lucky there are people like us to fix them.