What part of the country are you in....and what year is your car. I just saw an almost perfect 77 MB Tex interior on Ebay, located in Ohio. It includes practically every colored part in the car, so would even work if changing from a different color. By "almost perfect" I mean it's the best early 123 interior I've seen in years. Wrinkle free door cards, even.

I'm not affiliated in any way with the seller, just giving a heads up. http://cgi.ebay.com/ebaymotors/Interior-seats-door-panel-armrest-Mercedes-300d-W123_W0QQitemZ380116869708QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item38011686970 8&_trksid=p4506.c0.m245&_trkparms=65%3A10|39%3A1|240%3A1318

Oddly enough, they want $700, but will take $250 if the buyer can pick it up in Ohio.

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1979 240D, 4spd manual, Power Sunroof, manual windows, 147k miles, Pastel gray/Black MB Tex.
1991 300D 2.5 - Smokes like it's on Crack!