G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies
Almost all 73-77 A-Bodies were available with vinyl roofs as shown in the Fisher Body manuals I have. And many of them went all the way up to the windshield. The easiest way to tell if your vehicle came with a vinyl top up to the windshield is by looking at the exterior a-pillar trim. If it is textured like vinyl then it most likely came with vinyl from the factory. And if its smooth then you can guess the other scenario. Hope this helps.