I managed to put a slight scratch in one of the calipers during the initial fitment (not the one pictured). I called Wilwood, but they don’t sell touch up paint for their custom colors. They did however recommend using fingernail polish.
I stopped by a beauty supply store on the way to work today. The lady there was really helpful and let me try a bunch of different fingernail polishes until I found one that was nearly a perfect match.