The windows were made for Travelux by a window company that supplies many trailer makers. I looked through my records but did not find the brand of windows. Is there any marking like a name or logo on the windows? You could take a picture of one of the windows, post it in Vintage Kin or in this section of the repairs department.
Windows, Doors, Locks & Vents - Airstream Forums
If you could identify the maker it would help although you may not have much luck getting new parts for such an old window.