If you can’t source an OEM window;
AND it’s flat;
AND the Binswanger Glass in Raleigh isn’t too far from you;
most likely they can provide custom cut safety glass based on a cardboard template.
If it isn’t flat, there’s still a chance they can custom bend depending on complexity of shape. I’ve dealt with many glass shops for vehicles, equipment, and structures over the years. Have had the best luck with Binswanger for the odd and difficult custom stuff.
www.binswangerglass.com