Lucas up-rated, light weight starter motor, fits MGA, early MGB, MGTD / TF (with 120 teeth ring gear), Bristol 6 cyl, Sunbeam Alpine, and Triumph Herald. 9 toothed gear. Strong, powerful, offset gear-reduced starter motor, delivering huge cranking torque through a set of steel internal gears. Lightweight, compact and durable this unit starts the engine faster with immense power, whilst drawing less current from the battery