Gasket, Exhaust Downpipe FITS 1969-1997 XJ6, XJ12 up to 1987, All XJS With 4.0 & 5.3 & 6.0 Engines. Crush-ring donuts that go between the exhaust manifolds and the catalytic converter. Sold individually each six cylinder requires two, each V12 requires four. Replaces CBC4834 C18405 C184051 (EBC9388)