That is good advice---for an Evinrude 7.5. But for the 5D10 Gale & Johnson TN models in question, use the 3hp-5.5hp impeller by enlarging the center hole to fit the shaft. Original part number was 375688
RCO wrote:You can use a 277181 OMC or 18-3001 Sierra pump, but you will have to carefully thin it down on a sander. They are the same O.D. and I.D as the original, but a little thicker.