Sierra 18-3098 Impeller The Sierra 18-3098 Impeller is interchangeable with the following: Mallory 9-45302, 9-45302-10, Mercury 47-161543, 47-16154. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Impeller Meets or exceeds the original equipment quality Sierra part number: 18-3098 Interchangeable with the following: Mallory 9-45302, 9-45302-10, Mercury 47-161543, 47-16154