If it is just the bezel you could get this 1970 Plymouth Cuda Left Headlight Bezel Perfect 70 Barracuda Mopar | eBay as long as your chrome trim is still ok. I needed a pair of bezels for mine but it worked out better to buy a complete grille with the bezels. In your photo that is the LH that is damaged, but there are RH ones out there as well if you only need 1 it would work out ok to buy but if you need both you would be better off to get a complete grille. Mopar 70 Cuda / Barracuda Grill 1970 Grille Headlight Bezels Stainless Trim NEW | eBay I think the most original repops are the ones from here Mopar Restoration Parts, B/E & A Restoration, Mike Ross, New New Stock he only has them listed complete with the park lights but if you call him you may be able to get it without, I know he was not going to make any more of these parts and they were the best. I got a complete grille (without the park lights) and some of the last of his park light lenses and they are identical to OEM ones but they weren't cheap.
I have a repo grill I bought from B,E&A , ibought the complete grill with all the trim attached and the park lights. Im very happy with it , fits good and looks nice , I payed a little over $ 1000 for mine from Herbs parts in Delaware