Yamaha Part Number: 63V-44352-00, 63V-44352-01 02 03 (Check OEM Part Number beFore purchase, very IMPT!!!!) Propeller Dimension: Outer/Outer Diameter: 52.25mm , Inner Shaft Hub Diamter: 12.86mm, Height/Depth/Width: 13.86MM, No of Blades: 6 For Sierra Outboard 18-3040 Note: Not the original, but a substitute.