louvers

This guy had an NOS one for the rear window, missing the mounting hardware.
This was at the end of November, it was listed on Ebay at the time, to the best of my knowledge, his reserve was not met. (I don't recall the $).
They are an extremely rare item for Darts and Dusters, these were more common on Chally's and 'Cuda's as well as Aspens and Volare's.

It's only been 6 weeks, he might still have it, make sure you are sitting down when he tells you the $$$.

http://www.rmparts.com/

Good luck.