Hi Jeff,
we were just talking about your airstream and we would love to find one like it... yesterday. Kind of weird. What I did to find parts like that is search Craigslist (I use crazedlist, it searches all the craigslists across the country at once) for Airstreams that people are parting out, also, check with the Vintage Airstream clubs site (airstream.net) and post on this forum with a request... someone may just have have what you need lying around.