Its probably not laminated glass if not stated as such and will have to be replaced with a lexan material if the record in your class is over 200 mph. I lost my Studebaker Avanti rear window (tempered glass) at 175 mph, made a big mess on course #1, major clean up on the salt for 1 hr, had to buy a bunch of beer!! Later I installed tinted lexan material that allowed me to bolt the window into the rear of the car, turned out great, I just made a wooden structure to match the curve of the window, then started cutting and bolting the lexan into position at the middle, then worked out to each direction by cutting bending and bolting down each side, when finished it was very strong and no way will it ever come out again, the car has been to 216 mph with no problems, Dave