Bolt, 5/16in x 1-1/8in x 26tpi, zinc plated. BSCY / CEI with slightly domed head, Lucas headlight fixing pin, Norton AJS matchless Triumph style pre 1960s. Original part number: AJS Matchless 000365 Norton 112201 - headlight fixing pin; 3773 fork buffer pin Norton military and trials MT3/LU/112201