The license plate light assembly is missing on my car. I looked around a bit and this is the only one I found. https://www.moparmall.com/Plymouth-Duster-Dodge-Dart-Demon-Sport-A-Body-p/722-138_a.htm

Is this all that is available? Seems odd that the big guys don't carry the part. Maybe it is something this guy tooled up and nobody else bothered with it?

Seems kind of pricey, but if he tooled up to make a part that he won't sell much of....I understand the price. I'm fixing up a 70 Duster, and if mine doesn't work or is MIA, I will just bend up a bracket and mount some sort of LED light to it that is bright enough to illuminate the tag. My car is just going to be a hot rod, so originality doesn't matter.

Should be same assembly as Valiants that used that same bumper; might try Wildcat Auto Wrecking in Sandy, OR.

If Wildcat had the part they would probably charge $200 for it.

Ebay shows a reproduction about $95 delivered - maybe more for less, only looked at 1st page - and plenty of workable ones as cheap as $7.
"Workable" means you'd need to fab a bracket.

Try posting on FABO. I am sure there are plenty of nice used ones still out there...

Unless you have to have it right away just keep checking around & on Ebay a good used one will turn up for a reasonable price.

Manufacturer..... https://vansauto.com/product/license-light-assembly-66-67-b-body-70-75-duster-dart-sport-and-demon/

there is one on the classifieds here.

A local A body guy had one in his parts stash that was missing the lens. He donated it to the project. The original bracket has the neat little wire holder in the center that the reproductions are missing.

I got one of the reproduction brackets from Vans but it looked like CCC so I tossed it and used the factory one that I found. I did use the socket and lens from Vans. I also got a reproduction lens from Mancini. The repo lens from Mancini was a little nicer than the Vans lens. The Mancini lens was an authorized repo and it looks nicer and has the original Mopar pentastar on the lens. Not that it really matters to me but it might to someone else.