I don't think regular tempered glass will withstand the heat.
You might see if Corning has a customer support number or email address for possible recommendations.
Have you tried a used appliance store or even Habitat for Humanity ReStore to see if but sheer luck you might find a replacement there?
Just for fun, I tried to see if I could find you something. That model number did not seem to correspond to anything Admiral but maybe it is just too old. I did find this site. Perhaps one of the glass panels would work? The chat function was very responsive.
If you have to replace seals and everything it looks like this project might cost you $250 for the parts. Sure it is not time to think about a new unit? It is sad we are a disposable culture but that is a lot to sink into a 20 year old appliance? If it is self-cleaning all the oven door seals are probably do for replacement.