Despite owning Air force II's in the past I couldn't tell you the Ral number for the paint, but Retrobike member "justbackdated" might know, he's a Pace fork expert.
If you want touch up paint then there's loads of car paint touch up pens etc available, just a case of finding the closest match, it may not be perfect but should be a close match, worth a try as they're only a few £'s each.
