To confirm what has been said and provide a clear summary, 64 and 65 Dart, Valiant & Barracuda 2 door hardtops all use the same door shell. The 66 is the same except for the exterior lock cylinder hole so if you are willing to use the larger lock cylinder the 66 door fits 64 & 65. The 63 door shell differs in the door mounted latch/striker opening. The 63 door can be made to fit by grinding the latch opening larger and re-drilling one of the three holes to match a 64/65 striker. Everything else is an exact match. Also, as has been mentioned, the vent wing assembly is different for the convertible but goes right into any of the door shells. The convertible alignment "thingy" can also be added to any door after drilling two tiny screw holes.
