TRF doesn't have the glass anymore. I asked Charles and he said if he can get enough interest then he can have them made up. VB sells plexi for $400.
The ebay ad doesn't show the rear window separate from the frame. That's why I think it's flat. Mine is this way - just a 1/8" piece of Lexan the you bend around and push into the seal.
There are MANY pieces of weather stip (and hardware)needed to complete the installation. The picture showing the weatherstrip ONLY shows the rear backlight seal and some other small profile piece. I think the small one may fit the bottom edge of the fiberglass backlight between the rear deck. But, no furflex, no side trim, no window trim, no winshield cap or seal, no base seal, no escutcheons for attachment. Also the soft top frame doesn't show the rear retainer bar. It all adds up.
If you are interested, expect to pay some more to get it right.