I don't know whether I posted this information or not. I intended to, but in case I didn't:
I had a lot of trouble finding a source for door rubber for a Chrysler "M body", In my case a '76-'79 Dodge Diplomat Coupe.
I finally located a supplier at http://www.weatherstripspecial.com
I got good quality stuff quickly.
If I recall, I dealt with a guy named Ed. If anybody else has had the same problem, you might check with him.
Jim