18"x24" crankout window (Scamp)

[Spencer]

I am looking for a replacement 18"x24" (tall x wide) crank-out window for my 1983 13' Scamp. These were the ones that have square corners, (as opposed to rounded off corners like the newer ones).

Any suggestions as to where I can find one would be greatly appreciated.

Currently the previous owner decided to put a window A/C unit in the frame for that was the window. So all I have is the frame, and no window.. Anyone want to trade an A/C unit for a window.?
Thanks