Impeller for Mercruiser ref. 47-89984T4 Impeller for Mercruiser ref. 47-89984T4 for Alpha One gen I foot produced from 1983 to 1990 Int. diameter: 22.2 mm Ext. diameter: 60 mm Height: 33.8 mm No. of blades: 6 Compass type: G IN CASE OF ANY DOUBTS BEFORE PURCHASING, PLEASE SEND US A COPY OF YOUR ENGINE MANUAL BY EMAIL TO CONFIRM THE SPARE PARTS, WHICH MAY VARY DEPENDING ON THE ENGINE MODEL