I'm fairly sure that the 70-81 windshield is the same dimensions.
Yes it should.
No
No, they are 2 different bodystyles
No It won't fit unless you use the 76 + windshield with it.
Simple answer...yes. Not much changed between the years until 81.
no one cares
That depends on the make, but not likely with that many years in between.
NO!
Yes.
Yes, the windshields should be the same.
Yes it will fit, They are exactly the same body style
The hardtop from a 1963 CJ5 will not fit on a 1973 CJ5. Some people have found that if they put a different windshield on it that it will fit, but then you have to adjust the wipers. It is best to get a top that fits the measurements for the model you have specifically, for best results.