can you take some part of thats painted ,bring to the shop so they can mix it? I`ve done that before...they should be able to use one of those "guns" that Home depot uses to give them correct mix...when I got touch up for my old green Triumph ,which nobody knew what color it had I brought them the rod that holds the hood open , they mixed perfectly a small touch up for me...could not see color difference where I touched up.