Brian, PMS (pantone matching system) relates to printing colours rather than car spray colours so its really a visual reference. Possibly 185C / 186C (from my pantone book) C stands for coated, as in coated (gloss) Paper. With printing inks the type of surface will affect the colour.
The safest way is to send a colour sample and request that they match that, then they can choose from their Pantone book. Hope that helps, john K
