I’m having a bit of trouble visualizing the RL equivalent of polymer. While I do know of several cars with fiberglass bodies, I can’t think of any with a pure plastic or “polymer” body. It has nearly identical stats as fiberglass except it has a very high tooling cost instead of material cost. Is it just a form of mass-produced fiberglass? I can’t really think of any other equivalent.
I’m thinking first-generation Saturn…
youtube.com/watch?v=gEhaxgohXdQ
…and a more “official” commercial for their dent-resistant polymer panels… youtube.com/watch?v=_W26FX5YP3Y
I’ve been thinking of something like the fiber reinforced plastic used for body panels in the C4-C6 corvettes. Still technically fiberglass, but much more flexible and lighter (and made in an automated press).
That is what it is supposed to be, yes 
The Clio MK2 (and forward Renaults) had a plastic side guard, and the Smart had a plastic body.