Triumph 650cc/750cc unit twins (T120/TR6/6T/T140/TR7/TR7T Trail) crankshaft driveside bearing, 500cc/650cc pre unit twins crankshaft D/S roller bearing conversion 1-1/8″. Also for BSA 500cc/650cc A50/A65 (1963-73) Crankshaft bearing D/S with roller race.