Original "Effbe" impregnated (rubberized) textile diaphragm "leafs" for the pump mechanism on the Solex AIP carburetors.
These diaphragms now tend to suffer from age and the ravages of aggressive modern fuels which causes the "rubberized textile" material to harden and even crack, causing erratic running of the engine and fuel leaks.
Replacing the diaphragm is then the only sensible option.
Each set consists of 2 leaves.
Required number per carburettor: 1
This is number 80 in the drawing of the Solex AIP.