The fender aprons and anything else that is black, like the core support, is a less than semi-gloss black that is officially known as “REFINISHER’S BLACK”.  There are a couple paint companies. Martin-Seynour for one, that actually sell one by that title.  It has the proper combination of not glossy, yet does not capture dirt like a true flat color does.  If you want to really make it flashy looking, use gloss black, but the sheet metal under there is such a pain to get the glossy to look good.