Sierra International 18-3434 Marine Water Pump Kit for Yamaha Outboard Motor Sierra Prop Nut Kit Contains Prop Nut, Cotter Pin and Prop Spacer Sierra part number: 18-3717 Interchangeable with the following: GLM22340. Evinrude/Johnson 175268, Mallory 9-73951 Fit specific, check part numbers to ensure proper fit