Bearing, mainshaft, roller, for Norton single cylinder engines. Sterling brand. This bearing is a roller bearing. Early engines have two bearings, later engines have two rollers and a single row ball bearing. Use the double row ball bearings as an alternative - they were used on all military Nortons. OR use the roller bearing without the lip and use a spacer as used on International engines.Original Part Number:9033; A2/30; 17704 - Mainshaft ball bearing driving side8858; A2/32; 17702 - Mainshaft roller bearings
