Sierra 18-0265 Oil Seal The Sierra 18-0265 Oil Seal is interchangeable with the following: Mallory 9-76412, 9-76421, Yamaha 93101-28M16-00. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Oil Seal ID: 27mm, OD: 43.25mm, Width: 7mm Sierra part number: 18-0265 Interchangeable with the following: Mallory 9-76412, 9-76421, Yamaha 93101-28M16-00