Carburetor Float measures (1.5") includes Gasket  This is the float chamber float for all cars from 1963 to 1977. Rolls started to fit a smaller diameter float to the Series 3 Silver Cloud...

This is the float chamber needle and seat kit. Note: 2 kits are required per car (Sold Each) 1966-1998 All models with SU Carburetors  

This is the carburetor kit needed when servicing the carburetor (2 kits required) per car.   You will also need the Main Carburetor Needle (UE36062) & the Diaphragm Spring...