I bet the stuff that is on sale, is the stuff they will not be making any more. Beside the 67 69 Barracuda rear quarter panels. I think they just did a run and have a lot of them in stock.
I know for sure that I was told from AMD is 63 to 65 B body stuff is all done, 70 71 Duster rear quarters done, and 73 and Duster fenders done (but the fenders he said they have a lot of them).
There are not making anything new beside what already in the works and I believe that is 66 67 B Body stuff. They are done with anything new for mopar so no 67 to 69 Barracuda fenders