1971 Duster Handeling

There's also the DC style front spoiler for the Dusters, although I can't find anyone selling a replica at the moment
9392825212_4ef18a4f70_o copy.jpg
And the rear DC spoiler, which is being sold currently. I have one from this seller, it's a pretty accurate recreation...
70-76 Plymouth Duster and Dart Sport Showcars Rear Spoiler | eBay
9392824540_1a79027418_o copy.jpg


And for a more air dam version there's this...
Awesome A-body air dam for under $30!
air-dam-1-jpg.jpg

It's off a Ford Ranger. This is obviously a Dart but since it's mounted underneath it should work about the same on a Duster. Probably do a better job than the Camaro spoiler since it has better coverage. Not sure it looks as good but if what you're after is aerodynamics it's probably the better choice.