The national glass you are looking for will interchange with the Tokheim 39 window/rubber kit if the window is more vertical. If it is more horizontal in nature and curved it will swap out with the Tokheim 300 window kit. Both of which are $25 for the kit. I should be able to tell you which, but here at my home PC, sadly I don't have my OFFICIAL Jack Sim manual. On which, I have become entirely too dependent!!!
Owner, Vic's '66'