As I watched my car and others being built at Saleen, I recall the stripes area being sanded and masked and added prior to the full clear coat operation. Therefore, the stripes would have clear coat over them and blending to the base color. Not sure on the Heritage.
If you have blue stripes on a white car, I recall the color is 'Ford Motor Co. Sonic Blue'. The color was used on Mustangs extensively up until 2006. My car is covered in storage so I cannot check, but it may have the color code of the base color and stripe color on the ID plate..it would typically be a 2 alpha code (ie HH etc) . Check out the Sonic Blue...wish I could help you out more...
andy (AJB Blue White Stripes 2006 0541)