Thanks for posting. I replaced the driver's door seal w/ URO ($35). I definitely wouldn't pay for the M-B brand seals. It has worked OK, but perhaps is too soft. I once tore it a little by pulling on it to close the door.

I have seen no visible rust anywhere in my two 300D, other than the trunk where water was sitting in the wells (under plastic liners). The drain holes easily clog. But, water also shouldn't get into the trunk. When I had to replace the rear window in my 1985 due to a tree branch in a storm. I found rust in the center bottom of the window gasket channel, rusted off about half the lip. I wirebrushed it shiny and painted well. That seems to be a place where they rust even in California. The trunk leak is also exacerbated by the rear body curvature which doesn't allow much downhill slope for the trunk channels to drain.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans