I've got a roll bar sourced from Hall Pantera. I do not know who Hall gets them from.
It's been reconfigured by them just a hair, theoretically to give the arm rest a little room where the first design hits. It's still very close.
It fits very closely to the top part of the window gasket.
I wondering with the roll bar in the car how the glass is going to be truly removable anyway?
I definitely agree with you about the additional accessibility aspect to the engine.
My 5" tall velocity stack on cylinder #1 is right against the glass. Just getting to the front two carbs, taking out the glass would be very helpful.