Sierra 18-0297 Oil Seal The Sierra 18-0297 Oil Seal is interchangeable with the following: Mallory 9-76413, Mercury 26-82234M, Yamaha 93101-23070-00. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Oil Seal ID: 22.75mm, OD: 37.25mm, Width: 6mm Sierra part number: 18-0297 Interchangeable with the following: Mallory 9-76413, Mercury 26-82234M, Yamaha 93101-23070-00