I looked at a 69 Dart Swinger that was recently restored and there were was a hole in the door jamb that I never seen before. It's closer to the top of the door jamb (just below A-Pillar). I checked my 69 Dart and there are no holes that high above the door switch. Any thoughts?

There is also a hole in both doors above the latch that does not have a plug. My Dart also has the holes and not plugged off. Any thoughts what type of plug?