As fitted to :- Norton - Singles/Twins (1965 onwards) pear nipple, Norton Electra ES400 (1963-1965) pear nipple, Norton 650S/S 650/99 (1966) pear nipple, Norton Atlas/N15CS (1965 onwards) pear nipple, Norton P11/P11A (1967-1968) pear nipple Outer length: 35" OEM: NM24987,01-3615