Gj, must be a Florida thing. In my area the flat roof trucks have less rust out than the peaked roof trucks (81-93 regular cab) Even the 70's roofs are easier to find.

To the op, 72-93 regular cab truck are all donor candidate, 81 up has a crease above the windshield but it's strictly cosmetic.

If you want to do it factory style at the spot welds, be prepared to take a big chunk of the cab apart.