I have purchased several of these vents over the years. The last two were
from Inland, I plan on getting the next from Airstream Dreams as they just
came out with a fiberglass one that looks like it just may last 30+years.
The plastic ones have only been lasting me 5-7 years.
The problem with the fit seems to be limited to just a few trailers - for
some reason Airstream made a few a different size.
Scott
60 Overlander