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Convertible TechThis section is only for questions or information relating to a convertible. Questions about drivetrain modifications should still be posted in the engine specific sections.
Mine was originally glass but I changed it to plastic. From what I was told by the installer, they were all glass back then. He had to rig it up for the plastic window.
They were definitely glass. I've installed plenty of '83 to '93. Plastic is a good choice though.
Some of us installers wonder if the heavy glass was a good choice by the 'Stang design engineers. Sometimes the plastic ones last as long or longer than the glass windows with the problem of having delamination issues of the topping coming loose from the glass.