1965 Dodge Dart Charger

Omnthe lower end of the inner fender there is a small plastic thing that covers the area where all the mud comes from the front tire.

Does anyone know if these are being reproduced?

Yes, Gary sells these, at least for a 62 Lancer Valiant. I would think they are quite close to yours. The ones I got were close in shape, but the material was quite different. They have a little real, real, light green tinge, not real noticeable, but it's there. Here are a few pictures of what I got.