Total shot in the dark - Jalousie Window

I have a 1964 Safari 22ft twin model that sustained some damage by the previous owner. The repair was not a professional restoration and the original jalousie window was replaced by a smaller jalousie from a different model airstream. Any leads on where to find a replacement window of the same size would be greatly appreciated. My trailer originally had the larger single window rather than the two smaller windows. Thank you in advance for any help or suggestions.