Windshield parts Marine Glass Specialties in Florida
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My front windows are glass. It is know as "school bus glass", a non-tempered glass lamination with plastic inside. A good glass shop should be able to cut them for you. For plastic acrylic is the clearest compared to Lexan. In either case the plastic is not UV stable and will need to be re-done in a few years.
I replaced my opening side windows with clear acrylic and made them fixed. I set them in black silicone but have since changed my mind. The flex of the boat broke the seal to the plastic. I'm using a 3M automotive windshield product now. Messy to work but better adhesion. Use clear silicon to caulk the window frames.