Please do the Mopar world a solid and send that to RylisPro up in the Bay Area to reproduce. He is the one that makes the AAR and T/A (racecar version) spoilers.
I’ve got an original DC ductail spoiler. It’s not NOS, it looks like it was previously mounted but it’s in good condition, more than good enough to pull a mold from. I’d be happy to loan it to them if they want to pull a mold from it
The one from Showcars is actually pretty good. The biggest thing about that one is I think they stopped the mold on the outer edges a bit too soon, so it has a vertical edge on the sides that makes it a bit shorter than the original DC spoilers. You’d have a bit more trunk showing on each end unless you did some work on it. But it wouldn’t take much.
How soon are you looking to get one? I have one from Showcars, but I’m going to be using the MAS one that I found after I bought the Showcars version. I’m a little ways out from my shop being finished and moving a bunch of stuff out of storage. If you’re not in a big hurry we might be able to make a deal on my old Showcars one.