Bearing, bottom end fixing kit, for Norton twin cylinder engines twins 500, 600, 650 and 750 up to engine number 212278. Four bolts and two studs. Threaded 26 t.p.i. Tighten to 5/16" crankshaft studs or bolts (all pre mk3 twins) 20lbs/ft.Original Part Number:1 crankshank fixing kit (CSFK-VE); - crankshaft stud x2 - crankshaft bolt x4- 5/16" BSC short crankshaft nut x6- crankshaft nut x2D12/929; T2032; 067534 - crankshaft tab washer x2