you may want to try Inland RV Center Inc in the city of
Corona, CA. Phone # (909) 734-8130 or
www.inlandrv.com or you can email them at
Inlandrv@aol.com.
I am not sure if they have what you are looking for, but they seem to have lots of stuff for Airstreams!! Good luck
I have found many parts for my "72.