This is the engine sump plug. Supersession RG3744 When used as an engine sump plug / drain plug you need washer XB1093. It is also the drain plug on the Silver Shadow and Bentley T fuel tanks from...

This is the oil pan gasket also known as the sump gasket.   Bentley S1 & Rolls-Royce Silver Cloud I

This is the Rocker Cover Gasket. You may need (1) of Part# WHT002908 - washer and (3) part# EB3998 - Grommets when making repairs 1956-1959 Silver Cloud I & Bentley S1 (6 Cylinder models only)