This is the breather o ring that sits between the breather elbow and the plug. 1959-1965  Silver Cloud II,III & S-2,3 1959-1968 Phantom V 1966-1980 Shadow, T, Shadow II, T2, Corniche,...

This is the O Ring between the breather pipe and the flame trap. 1959-1965 Silver Cloud II,III & S-2,3 & Phantom V 1966-1970 Silver Shadow & T-series Up to VIN 8861  

This is the gasket for the breather cover on the front of the B bank cylinder head.  Supersession: UE40741 1980-1983 Camargue (VIN 50456-50776) 1979-1982 Corniche (VIN 50271-50757)

This is the O ring between the breather pipe and the flame trap. 1970-1980 VIN 9001 TO 41686 1981-1998 Spirit, Spur, Mulsanne, Turbo R, Pre Arnage, Azure  

This is the oval gasket between the breather and the crankcase. 1946-1955 RR Silver Dawn & Silver Wraith, Bentley MkVI & R Type