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.
http://www.appliancezone.com/SearchP...0Door%20Glass#
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.