If it is flat glass I would go the a glass shop. If it is curved and you want it fixed right a way I would go to a plastic shop and install Plexiglass. That is what is in my rear window.
Waiting for a replacement from JC will take some time. Large and breakable items are often held till a trailer is being shipped to the dealer you order from.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles