moparcrazy
1.63 Dodge or Plymouth B-Body 2dr sdn doors are the same.
2.64 and 65 Dodge or Plymouth B Body 2dr sdn doors are the same.
3.Differences in the 63 to the 64-65 doors.On the 63 the latches are different than the 64-65 and the 63 windshield lays back more,so the door frames are different than the 64-65. The door glass are all the same 63 to 65 Dodge or Plymouth.The vent glass( see pictures the 63 is more pointed than the 64-65) for 63 is its all own and the 64 and 65 are the same Dodge or Plymouth.The quarter glass are also all the same Dodge or Plymouth.
I have done research for 4 years between Hollanders,factory Mopar factory parts books,and gathering parts from parts cars.There are different ways the conversion can be done,but the easiest way is to find a donor car.The 63 donor car would give you all the right parts to do the conversion(latches and window frame)but the 64-65 could be used,the door frame would need to be changed as mentioned before.
Here are some reference pictures and a site that may help.
This site he uses a 2drht for the donor and uses the door frames from the 4 dr.
http://www.forbbodiesonly.com/moparforum/showthread.php?26525-1964-dodge-2-door-conversion
I hope this will help and I will answer questions if needed.
Jeff
I didn't mention the reason for the research,I have the 64 Belvedere in the picture that I have gathered all the parts for the conversion.