On a 66-7 B-body, the same applies. Two door sedans use the same roof as a four-door. You need the post doors, quarter glass, glass frame, regulators, and preferably the quarter panel structure and pillar.
68-70 B-bodies won't work as the two door sedans and hardtops share rooflines, their difference is in the quarter glass. One rolls down, (coupe/hardtop) the other swings out and has a "B" pillar (sedan/post car). Take a look at 68-70 four doors, you'll see it.
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Hey, mr. b, when am I going to get a look at that 63? Alabaster, right? -Don
A buddy of mine was at the Norwin cruise the other week and sent me a random video of a 63 leaving... looked like yours.