I found the rear Accent Panels available from Kernersville Chrysler Jeep in Kernersville, NC.
Cost is about $230.00 plus shipping. They state 4 are available. If you can't access from what I have copied and pasted below, look them up, and call.
Edit: thanks to csteve for finding them, and alerting me. I don't need them, but some of you might..... Have fun
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Quantity:
$230.95 + $4.34 shipping
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2005 -2008 Chrysler Crossfire Accent Panels, Rear Fascia