OK, looking for a source to purchase RV windows from, I want to install 2 small RV windows on each side of my enclosed trailer. I'm after those small types you'd find near a bunk on an overhead camper or a trailer. I have 16" centers for metal studs, so I'm after one that is 16" long, about 6-8" high, rounded corners, window slides half open from left/right or right/left, has a bug screen. Not the flip up type, the slider type and smoked glass. I have looked with little success, anyone have a source?