Doesn't look faded to me. It's gray evenly all over. No faded areas.
I'd take it to a dealer and have them look up the paint code. It may be molded plastic so there is no paint code.
Worth a try to have the parts dept. look it up for you.
2004 E60 530is, Delivered 12/12/03, TiSilver/LGrey, PP, SP,PS, PDC, ACC, FRS, Step, Xenons, clear bra, body colored rear inserts. (Retired, 1983 henna red 320is)
2004 Corvette Z06 Commemorative Edition