Here is a genuine SU made gasket for the float chamber lid on a whole range of  classic British cars from the 1950s to the 1970s. It fits the HD6 and HD8 carbs as used on Jaguars, Rovers, Austin Healeys and many more. It is an original equipment SU manufactured item, not a cheap modern reproduction.

It has the SU number AUC 1147. The I/D is 53 mm.

If you need more than one don't forget to choose the buy more than one option.