Finally installed the side still extensions on my '17 ES. The install is pretty straight forward. The only real pain is installing the clear protective film. While I got it on there, it's not as smooth as I hoped. (The second set went way easier.) I go into a bit more detail here, so feel free to take a look.
http://www.subcompactculture.com/201...xtensions.html
I do have to say: I absolutely LOVE the look!