Here is a picture from March 1977 of an LA built Challenger R/T (A66).
When the headlight bezels were replaced in the 80's using Chyrsler replacement parts the argent was not present around the sockets. It came flat black with no texture. The only logical thing to do was to paint the grill flat black to match. It also covered the chips and other flaws.
Maybe others did the same. I would go back to the original argent if it were me.
If you find a good source please let me know.
Jon