odd sized roof vent?
Hello all, I have an old jay finch 1981 pop up that has a peculiar roof vent with no lid. I am trying to find a replacement, but can only find 9x9 or 24 inch vents. The outside flange on the roof is 10.5 X 10.5, but the inside vent hole is 8 13/16's. On top the is a circular opening that is 8 inches in diameter with a working hatch hinge. I'd love to not have tocut it out and rebuild the frame box, when all I seem to need is a vent cover. Has anyone seen one of these or know how it would have worked?