A&E made awnings to fit Airstreams from the 60's thru the 90's. They don't any more.
Zip Dee is the awning that the factor uses, and they are a tremendous awning.
Call Walt's in Ocala, FL to see if he can do one while you are under way. 352-237-6813 ask for Walt. He may want you to take some measurements, because the awning will need to be ordered. He can also give you an accurate lead time on the process.
WBCCI #5501 AIR # 49
1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato