ITEM NAME:Cylinder Head Gasket for Yamaha 2-Stroke 9.9hp 15hp 18hp Outboard Motor Description: Replaces Number: 63V-11181-A1-00 Engine Position: Outboard Engine: for 2-Stroke 9.9hp 15hp 18hp Replacement parts are available in stock Fitment: for Yamaha 2-Stroke 9.9hp 15hp 18hp Outboard Engine Specification: Center Hole Diameter: Approx. 58mm / 2.28inch Package Includes: 1 Piece Cylinder Head Gasket.Engine: for 2-Stroke 9.9hp 15hp 18hp. Engine Position: Outboard. 1 Piece Cylinder Head Gasket.