The most reasonably priced component used on the Nt650v Deauville 1998 (w) France / 25k Gasket Kit A is the Washer Seal, 6mm.
In this schematic the "Washer Seal, 6mm" is used most often.
This part-list fiche shows all the components that make up the Nt650v Deauville 1998 (w) France / 25k Gasket Kit A .