Demon fold seat

dont matter. it's still a nice car. maybe not to the show car / trailer queen subset.

the hang ten duster also had the fold down seats if that helps you find the panels.

here's another thread about them:
http://www.forabodiesonly.com/mopar/showthread.php?t=246133

as far as i know the name was changed over from 72 to 73. 71,72 was dodge demon, in 73 it became dart sport.
some people prefer the demon front and back so that guy swapped them out. i like them both, but i'm sure he spent a lot of $$$ to swap the front and rear clips.

anyways, the panels that you have now might be able to be repaired...
some body shops are equipped to do plastics repair. if you check around and find a good plastic repair guy, he might give you some tips on how to make them like new.

or someone here who is real good at that kind of stuff might chime in. i know SEM sells a lot of plastic repair products. a whole lot of different products lol. that's why i suggested to find a plastic body repair specialist guy he could tell you which SEM products would work for your type of repair.
http://www.semproducts.com/automotive-plastic-repair
many of their products are not listed you have to search around the site. plastic adhesion promoters, special primers, etc

also this joint http://www.urethanesupply.com/