http://www.mbpartsonline.com/ gets you to Potomac. The newer ones (and driver's side, to boot) will, of course, be the expensive one. Never fails (at least with me) Good luck.

P.S. There are a couple of door panels (not the ones you need, of course) on eBay right now. At least it may give you an idea of price, availability, etc.

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)