1963 Dodge Dart 270 Convertible for the Wife

Jim Kueneman said
It came with a new convertible top with a glass window still in a box in the trunk. The one on it is plastic and is missing.

I dont think you're going to get that glass to lay flat in the well with the top down. Maybe that's why it's not installed. That would be cool if it worked but the way the well is designed I don't think there is enough room for glass from the back of the seat to the back of the trunk.