My Mom asked my opinion on these for her 2010 GT and I told her these are the ugliest things I've ever seen, but now looking at them on your Stang, my opinion has changed, I think they look nice and clean.
I wouldn't put them on my car, reason being, I'm doing the black everything route.....
She just saw an ad in a Mustang Mag, it didnt show them on a car or say the years of Stangs they were available for. Now that I see them on an actual car, I think they look really nice, if they do start making them for the 10's I'll give her the thumbs up, would look good on her Black GT.
On 99% of cars, I'd hate it on the spot, but with the Bullitt, I say well done! Kinda like adding black chin spoilers and such to a car for the Mach/Boss look like I am doing. About the only thing I don't love is the up-turn at the end of the back piece, but the front is full on old school retro. I'd suggest some of those chrome taillight surrounds available for your car next to tie it in further.