Oil damper rod (fork damper) or tube bolt and plain washer. Suits roadholders 1947 - 1958? Special reduced head to fit a spanner in the hole. Original shape changed for short roadholder but will fit all.Original Norton part number:B2/630 ;C2/630; 11160; 17075; D12/348; F11M2/630; 14247; 14275; 18857; 067635 - Oil damper tube boltC2/629; T1009; 067517 - Oil damper rod bolt plain washerdoes not include fibre washer inside the leg B2/628; T814; 067514 - Oil damper rod or tube fibre washer