This is the seal beneath the chrome escutcheon between the windscreen wiper wheelbox and the wiper blade. These are for models fitted with single twin jet windscreen washer. 1957-1959 Later models...

This is the bayonet fitting wiper arm.  Please note there are 3 styles UD1490, RH9606, RH8934 1956-1965 Silver Cloud, S-series, Continental & Phantom V

This is the Wiper Arm Spoon Fitting.  This wiper arm is to be used with wiper blade part #UD2134 1955-1965 RR Silver Cloud I, II, III & Bentley S1, S2, S3

This is the wiper blade spoon fitting style arm RH8934. 1956 to 1965 Silver Cloud and S-series, some Phantom V