47-89980 - Impeller for some Mercury models 4hp 1 cylinder / 7.5hp / 9.8hp replaces Merc # 47-68988
47-89980 - replaces Merc # 47-68988 Sierra 18-3054 (.438 ID) for some Mercury models 4hp 1 cylinder sn 5595532 to 9075838 for some 7.5hp sn 5206550 and up, some 9.8hp sn 5206550 and up. If your motor falls into these serial number ranges you should measure the drive shaft at the impeller location before placing your order.
