Ernest, Ran across these impellers for a not absolutely unreasonable price $200- $250. 15 and 16" DIA. You would clearly have to mill out the center to a larger size to fit over your engine shaft. http://www.clearvuecyclones.com/index.php?main_page=index&cPath=2_8&zenid=u74utpqtce7utpnu1jdr9s7v77 <http://www.clearvuecyclones.com/index.php?main_page=index&cPath=2_8&zenid=u74utpqtce7utpnu1jdr9s7v77>