Bearing, bottom end fixing kit, for Norton twin cylinder engines 1975+ Mk3 3/8 inc studs; Mk3 (approx 750N) electric start and disk front and rear. Uses 3/8 inch UNF studsOriginal Part Number:065671 - crankshaft dowel stud x1066607 - crankshaft stud x4066609 - 3/8" crankshaft stud x2065673 - crankshaft stud nut x14016213 - 3/8" washer x2