This o ring has a number of applications:

• It is the smaller inner o ring for the rear shackle pin in the Mk-6 and R Type range (2 per spring)
• It is the o ring on the engine breather system of later Series 2 and all Series 3 S Types and Silver Clouds and Phantom V
• It is the o ring inside the early Shadow and T1 4 speed gearbox between the intake pipe and the front pump
• O'ring for the Breather Pipe that goes into the side of the thermostat housing. (2 required)

1945-1955 MkVI & R-type 

1956-1965 Series 2, all Series 3 S types & Silver Cloud 

1966-1998 Silver Shadow, Spirit, Spur