"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
You haven't included any details / pics, but I assume the glass is fairly thick, and ( I hope ) laminated / tempered for safety. As the boys suggested, check out local glass shops / commercial glass shops for a matching gasket profile. They sure don't make anything just for this application. Steeles has a good selection of gaskets for specific automotive use.