High quality Touch up paint recommendations

A little off topic, but what do you guys do about touch ups on a vehicle that is more then 5 years old? I know typically there isn't too much paint fading in a vehicle that is 3-4 years old, but I have a customer wanting me to touch up some chips on her 2007 Mercedes CLK. I was going to take it to O'Riley for them to match the paint (the best they can at least), but the closest one to me is about 12 miles away and I hate to drive my customers vehicles (when given permission) more then I absolutely have to. These places that sell automotive touch up paint seems very convenient, but I worry about how much the touch up paint is going to be "off" from the now faded 7 year old paint.
 
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