OIL FILLER CAP, GREY ON VALVE COVER. SEE #10 IN SECOND ILLUSTRATION. FITS ALL 1998-2009 XJ8 XJR 4.0 4.2, 1997-2006 XK8 XKR 4.0 & 2000-2008 S-TYPE 4.0 4.2 V8. THE ORIGINAL OIL CAP ON YOUR CAR MIGHT HAVE BEEN RED........THIS IS THE JAGUAR REPLACEMENT CAP! NCA2647BB (AJ87922)