This window panel measures roughly 57 & 1/2" tall and 29 & 1/2" wide, and it's the latch-side of a sliding window (as you can see in pictures), which would roughly fill a 60" x 60" opening overall if you were to buy the whole window brand new.
This dual-pane window panel should be perfect for anyone who needs to just replace your latch-side window for some reason. I got this window because I actually need to replace one panel myself, but after I got it I realized I need the opposite side, without the latch.
Please examine latch in pictures to determine if this one can fill your window need.