I just attended our first Cruise Night (Marks Cruise Night, East Granby Connecticut, not unusual to have 900 cars, held every Monday) and to my astonishment, it was "Jeep night", and there was a single CJ2A, a single CJ3A, an M38, and a crusty CJ3B. There were probably 100 or more Wranglers.
Anyway, I drooled over the CJ3A and it was pretty well done. I noted all the channels on the windshield, noted how the vacuum wiper motor mounts (and realized I welded up the two vacuum motor mount holes on my windshield...doh) and generally was pretty impressed with the attention to detail. So it was great confirmation on these details.
But one more query: Was a rear view mirror factory issue on the windshield? And was it mounted like yours '55CJ-5?
My Jeep came with a rear view, but it wasn't mounted up top.
Dave