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My car didn't come with one so I purchased one and have yet to install it before I scratch my bumper. I wish mine came with it as it would save me the trouble of trying to install it.
The rear bumper appliqué should be easy to install...because it is not so long as to be cumbersome to center-up and precisely align. Just make sure the area is very clean and totally dry.
To fit 13-15 GS I am not sure and has not been attempted yet, my friend did it on the 16 as you see, I have not compared the 15 GS to the 16 GS bumpers , I know its different because of the taillights, but I would like to see how big a difference there is.
I just looked at pictures of the 2016 and a previous year. The lights look like they have an identical "foot print". I did not look at a picture of an "F", but the non F looks like the bumper cover and lower valance are identical to previous years as well.
I can't say for positive they are interchangeable, but they sure look like they are.