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Rocker box inspection (tappet) gasket for all Norton OHV singles with oval metal "NORTON" inspection cover, Made in UK. Model 18, 19R, 19S, ES2. NOTE: The Gasket is the size of the outer edge of the cover. The whole cover pushed against the gasket. For a gasket that fits within gthe tapper cover plate see teh modified version.Original part numbers:C3/95; - rocker cover gasket