I imagine the teardrop frame and even the lenses could be 3d printed if you had an old refrence to take measurments from.
Few videos out on 3d printed taillights and the media required.
Once cleaned up you could spray chrome paint over the frame so it looks like metal. Once again more videos out covering that.
The bracket(s) could be 3d printed with metal inserts once again using measurments off the old.
All this will pay off when your backed into by a soccer mom at the local Sunday meet or just pulling out of the garage.
Instead of looking for lets say 3 months and paying $400 you can simply grab the spares you printed when you made the ones on the car and after a few hours have the new set bolted up.