Forgot to mention that if it is flat glass, you can bring the other side to the glass company, and they can remove that glass to make a pattern for the replacement glass. Then take the pattern home with you, in the event that you bread the other side of glass.
I was looking at all the glass in my BX23S cab, and every piece has the Curtis logo on it. This makes me think that the glass is all tempered. I would use laminated glass because of cost, but when you are selling a lot of tractor cabs, then it is less expensive for you as the manufacturer to buy all tempered glass.