1972 duster to "feather trim" 1976 model

They made a lot more 73-76 Dusters than ‘70-‘72. The later cars are easier to find and usually quite a bit less expensive. The feather dusters were a pretty small number, but anything ‘73-76 would look very similar. And anything ‘74+ would be easier to convert to the feather duster options.

You might try looking on Facebook, there are lots of Mopar groups and Marketplace seems to be overtaking Craigslist as a selling platform.