To back up Mark's post he's correct in that the A/pillar angle from a 63 to 64 are different. I also, wanted to mention another area that's not common is were the door latches. If your trying to use say 63 door to a 64/5 quarter the sheet metal is same it's the striker / door latch If my memory serves me 63 door has what I'd call a more exposed latch mechanism where the 64 latch is more internal to the door sure, if someone wanted to take on swap it could be done ? Not a simple unbolt Just wanted to point that out I was restoring a 63 Dodge and bought a 64 Dodge door found out the hard way. Kevin's initial question he was using a 64 donor so, he be using a common year is this area but, he'd have issues with the a/pillar angle. Hope this helps