[wiredgeorge]

I have restored many vintage motorcycles and there are several paint stores (auto paint) in San Antonio that do computer matching; they can even put the paint in a rattle can. This should work OK unless the paint on the cap is base/color/clear and then all bets are off. You would be best to shoot the whole cap which would not be all that difficult except for the ladder and cap issue which is kind of awkward.