My '79 Charger has the same thing made by Finney's.
It was also damaged and I was planning on just dropping by a plexiglass shop and having a new one fab'd up using my old one as a template. I want to make sure the it matches the old one exactly, since I don't want to have to redrill any holes.
I'm in no rush since it was only about 4" of one side of it.