Tips and pics for glass doors
FYI those doors on that car BigDummy posted have a large horizontal plane on the top of the door to mount support. If the ones for you car are anything like the ones for my Bcuda you do not have a lot of real estate to mount the vertical support. if it is a track only car I would not worry about adding a latch to correct the flex in the window unless it drives you crazy. The doors are like tissue paper and if you come barreling out of the car one time without remembering to unhook or disconnect the latch at the top of the window you will break the door.