Vent box hinge - 1966 Plymouth Valiant

Thanks for all of the suggestions .... especially, mbaird! I'm still trying to figure out what works from one a-body to the next. I had no idea that a vent box from a 66 Valiant is the same as a 73 Demon. How DOES one find out these things?!?!?

Actually, I am pretty sure the vent boxes are different after 1966.....