The stripe kits from Ford are garbage. The stripes are too thin and they do not cover from bumper to bumper (to the ground). You should look around for a private company that goes to paint shops and does graphics for them when cars are being repainted. I know a guy that does that. He put a complete stripe kit on with me which takes a little time to make it look right. I soon after removed them and had the stripes painted and cleared because it started to bubble on me and I wanted a classier look anyway. If you can afford to go that route, I would.
I have a 2006 Yellow GT with 11in stripes from head to toe ,a stripe guy not a dealer cost me $450.00 dollars there is a mark up of $200.00 some dollars.
it does cost a lot to have it done because it is a lot of work. i did it myself (not precut - bad idea) and it took about 10 hours over two days to get it perfect. it is possible to do it yourself but it is a lot of work