X300, XJ40, XJS - Housing Gasket - Timing chain, chain tensioner piston (EAC4557)

EAC4540 - Timing chain, chain tensioner - Housing gasket (item 8 in the diagram).

This item is OK for 

XJS - 3.6L, 4.0L - VIN range All

XJ40 - 2.9L, 3.2L, 3.6L, 4.0L - VIN range All

XJ6 (X300) - 3.3L, 4.0L - VIN range All