Thanks for that Matt. It looks like it's a couple of inches too big up-and-down [though the length is perfect.

]. I think I can get 16" X 20" awning style, so I might go with 2 windows with a vertical fiberglass strip in between to fill the 4' space.... though if I do that it'll likely be one awning and one fixed. I should have replaced all the windows when I did the major reno about 4-ish years back .... too soon old and too late smart I guess. Thanks again. Owen.