Okay, this might be a self explanatory question but not quite sure on how the measurements go so if anyone can answer this simple question for me...I'd sure appreciate it; The exterior door on my house now had a small double-paned, etched glass window that got busted out. I can either replace the window or I have someone offering me a new (used) door for free. The exact measurements of my current door are 35.5 x 79. The door being offered I am told is a 36 x 80 door. Will this door fit? Or would it just be easier to replace the window? Thanks for any information on this.