I actually think your best bet is perusing eBay and finding sellers (which usually happen to be salvage shops with an eBay store front) parting out salvage Crossfires. My guess is it will be much faster for you to find a shop with a salvage Crossfire (like this one: 04 05 06 07 08 Crossfire Passenger Side Front Door CPE | eBay) and simply contact the seller directly regarding your interest in the piece you want.

You can also contact MrMoPar as others have said, however, he never responded when I PM'd him several months ago about a part. The guy is probably just busy but still, a salvage yard should be able to work out a deal with you for the window trim part you need. Then all you have to do is have it painted black.

You don't see too many "Base" model Crossfires around like yours - a bit of a rare bird. It has cloth seats with manual adjustment right?