Carburetor Float measures (1.5") includes Gasket  This is the float chamber float for all cars from 1963 to 1977. It is 1.5" in diameter because RR started to fit a smaller diameter float...

This is the gasket for the carburetor float lid. All models from 1945 to 1976

These are the small charcoal filters that sit in the inlet to the float chambers.   Note: 2 required per car, sold separately 1969-1987 From SY VIN 8742 to SZ VIN 19670 

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