I have a 2014 Mustang GT Driver Side Mirror for sale. It is power, heated with the pony projection lamps. My driver door was hit in a parking lot and the mirror got scratched too. Insurance replaced it so I have it here.
There was a small scuff on the extreme outside, I tried to get a picture of it but you honestly can't even see it (last pic).
Car had about 1,500 miles on it when it was replaced. It is missing the color cap for the front so it should work with any color so long as you have the cap.
Should work for 2013 as well, but please confirm that yourself.
I was told by my dealer this entire set up would run you about $280, but I have not confirmed that. With that said, I am starting this at $200 with an additional $10 to ship.