CBC8067 - propshaft coupling - washer (item 4 in the diagram).
This item is OK for the following models.
XJ6 - from VIN 500001 - 2.9L, 3.2L, 3.6L, 4.0L (automatic gearbox)
XJ6 & XJ12 (XJ40) - from VIN667829 - as above + 6.0L (automatic gearbox), 4.0L (manual gearbox)
X300 - from VIN 720125 - 3.2L, 4.0L, 6.0L (automatic and manual gearbox)
X308 - from VIN 812317
XK8 - from VIN 042775 to A30644 - not OK for 4.0L Supercharged
This item is sold as a single unit.