Since my windows are all installed I can't get a better measurement than you can just measuring the opening.
14 3/4" x 7 3/8"
hope that helps
Do you need the windows or just the measurements?
you mean the flippy ones right?I'm replacing my vent style windows with Lexan.
the glass at it's largest dimensions, 43.75" x 16.125". oddly, the height tapers slightly toward the rear-by about .25, i never knew that.