This is being sold as a set:
NCA2515AE - (Right Hand) Camshaft Cover Gasket Fits XJ-8 and XJ-R 1st Gen (X308) 1998-2003, XJ-8 and XJ-R 2nd Gen (X350) 2003-2007, XJ-8 and XJ-R Facelift (X358) 2008-2009, S-Type (X200) 1999-2008, XK8 and XKR Series I (X100) 1996-2006, XK8 and XKR Series II (X150) 2007-2014
NCA2516AE - (Left Hand) Camshaft Cover Gasket Fits XJ-8 and XJ-R 1st Gen (X308) 1998-2003, XJ-8 and XJ-R 2nd Gen (X350) 2003-2007, XJ-8 and XJ-R Facelift (X358) 2008-2009, S-Type (X200) 1999-2008, XK8 and XKR Series I (X100) 1996-2006, XK8 and XKR Series II (X150) 2007-2014
NCA2578BB - 4x Spark Plug Boss Seal Fits XJ-8 and XJ-R 1st Gen (X308) 1998-2003, XJ-8 and XJ-R 2nd Gen (X350) 2003-2007, XJ-8 and XJ-R Facelift (X358) 2008-2009, S-Type (X200) 1999-2008, XK8 and XKR Series I (X100) 1996-2006, XK8 and XKR Series II (X150) 2007-2014