Is this Rear trim panel from a 66 Dart?

A friend of mine who used to have a 66 273 Dart asked me to sell this on my A Bodies forum. He said he was sure it came with his car as an extra. Before I list it, I want to make absolutely sure it is for a 66 Dart. It is in what I would call GOOD condition. I'll clean it up and take more pictures before listing it. BTW, it was the only Dart part he had. Would $100 be a reasonable price to start at? I know very little about early A Bodies.

panel.JPG
Would $100 OBO be a reasonable price?