The stats are all good that they are giving but you need a piece of glass to fit the opening.You may have to go back to Griffin to do it right, You don’t want to screw this up, a life could be at stake.
I had to supply a piece of glass for an industrial application on a vehicle a few years back I called C.R. Laurence and spoke with them very helpful it was expensive and they made it to my requirements and it was ULC approved.
You could also remove the glass and take measurement size and thickness and find some company to make the glass, that will take a few weeks.

Mr. Yankee I have experience from fire and rescue depts. We will not go thru the glass to gain entree but can get in to one of these in less than 1 minute, maybe less than 30 seconds. I am not dissing you but No rescue unit will take the hard way in, but in fact will gain entry in the easiest way possible. With a jaws of life I can be in thru the door in seconds. Fact jack.