This (large) Tappet Adjuster Gasket fits late (56-60) Norton ES2, Model 50, Model 19S OHV pushrod models. It is made from high quality oil resistent thick gasket card material, as per the original
The accompanyning exploded engine diagram shows the type of OHV engine this tappet adjuster gasket fits, it being almost the last design of OHV rockerbox - which had a much wider aluminium tappet cover (with cast in 'N' motif) than the earlier 48-56 style rockerbox.
This gasket is manufactured for us in good quality oil resistent gasket material by a well established UK gasket manufacturer