I have been looking on the internet for RV windows and it seems that these square type, (24hX21w) windows have to be custom built. I requested a quote from one place and they came back with a quote of over $800 per window. To heck with that!
So I called a local camper factory, (small one in a very small town, and I've known the owner for years), and he said that no one makes that size of camper window. The closest is a 24"x18". However, he makes alot of auctioneer boothes that go into a back of a pickup, and he told me of a local Amish guy who builds these windows for the auctioneer booths.
I have contacted this Amish guy, and we are going to set a time to meet. So the story continues. I will post more as we go along.
Ron