I ordered some paint for my Legend Lime from express paint (see link below).
http://expresspaint.com/
All the colors for the 2005 mustang are available, based on color codes. The color codes are available on the inside driver door panel. They also have an image of the color, and the color description (windveil blue etc.) which can be used to identify the color. You can order the paint in a touch up pen, aerosol can, or in pint jars.
I ordered the aerosol can for the brackets of the hood lifts I ordered. You could use the paint for just about anything, spoilers, scoops, louvers, goodies, etc. I am gonna use the leftover paint for one of those plastic models of the car.
Don't forget to order a clear coat, because the colored paint is just a base coat, and a clear coat is needed for the beautiful gloss. If someone has posted this info already i apologize (i did search). I should get the paint on monday, so Ill let everyone know how it goes.
If you order, try to mention me (hazedav and themustangsource) as a referral or in the comments box. Im going to try to get some free paint out of these guys. Prices are reasonable.
David