If you've ever tried to remove one of those products that are held on with tape you'll see just how well there held on. I thought I was going to rip the truck off the hinges before I pulled the stock spoiler off it.
Here ya go;
http://www.mustangworld.com/ourpics/News/select4277.htm
http://www.modularfords.com/forums/f79/project-ground-up-76628-27.html
my opinion, too dark.
Oh, I didn't know you were talking about the width of the tire.
Most tire companies recommend 255 as the smallest you can put on a 10" rim. So safely it will fit, but like the above poster mentioned, it probably won't look too good.