Ollybridge, I too have the VS hard top, and after much researich last year I would suggest you either;
- contact Russ at Fibersteel. He can make the plexi windows for you. or...
- offer to buy the hardware from Russ and make the windows yourself. (relatively simple process, and plexi is cheap.. Making a foam board template is a simple way to mock up fit before cutting/drilling the plexi.)
attached are some pictures i posted last summer...
https://www.speedsterowners.com...6#356095480999232236
hope this is useful.