I agree with Greg! It may be a custom colour, but if I had to pick the closest Factory Ford colour available on our cars, it'd be Grabber Orange. My car is Grabber Yellow (D). http://maverickcorral.homestead.com/grabberorange.html
It is a Boss 302 mustang color from 2013 called school bus yellow. Paint code M6284 It is an industrial color that came on many trucks and vans.
Here is a picture I took today of my friend's '70 Mach 1 that is Grabber Orange. I also agree that is could be School Bus Yellow or something custom.