Curb rash fix..HELP!!!

I'm buying a set of 16" Enkei CDR9's from a friend. They are in great shape besides some minor curb rash on one of them. It is down to the metal, but just barely. All it really needs is some touchup paint. I would like to avoid having to repaint the entire wheel/set if I can. Any suggestions on how I can touch up the paint on it and have it look pretty good? They are silver painted. Any suggestions are appreciated. Thanks in advance.