I had a '72 T/2 and the problems I had were common across all models of that era, but I can't recall if it applied to the 80's Cals.
Anyway, when you disassemble the older versions by removing the screws on the inside, the glass is sealed by a gasket with a rectangular cross section that you can find a suitable replacement in a glass shop or industrial supply company. The Biggest problem was that the cutouts were often poorly cut leaving big gaps that were hard to seal.
One solution was to rebuild the Fiberglas for a better fit...very laborious and the one I foolishly chose.
I think the better solution was to abandon the aluminum frames, buy dark gray lexan and cut it in the swept style like the fixed ports on modern boats, bolt it to the cabin sides bedded in black sealant (carefully taped) and give her a nice makeover look. Use thin luan to make patterns for the fore and aft portlights before cutting and reverse the lexan side to side
