'68 Barracuda top with glass window

RedFish said
The OEM hard back glass will have a Corning logo on it. It's large and shaped much like a notchback glass. As far as I know, that correct glass isn't available new. A new aftermarket top with a hard glass will include a flat, generic glass.

100% correct and to add that NO Chrysler, Dodge, or Plymouth convertible from 67-71 had a plastic rear curtain from the factory.