Bearing, bottom end fixing kit, for Norton twin cylinder engines pre1975 Studs are UNF. Tighten to 5/16" crankshaft studs or bolts (all pre mk3 twins) 20lbs/ft.Original Part Number:1 crankshank fixing kit (CSFK);064185 - long crankshaft stud x2064184 - short crankshaft stud x4064160 - 5/16" unf short crankshaft nut x8064189 - crankshaft nut x4D12/929; T2032; 067534 - crankshaft tab washer x2