Premium Quality Replacement PartMuffler Exhaust Gasket for Yamaha YFZ450 2004 2005 2007 2008 2009 2012 2013Fits Following Yamaha Models:YFZ450 2004-2005 2007-2009 2012-2013Order Includes:1 x Muffler Gasket #1: 8FA-14714-10-00 8FA-14714-01-001 x Muffler Gasket #2: 3VD-14613-01-00 3VD-14613-00-00Width #1: 1.35″ | 34.5mmWidth #2: 0.13″ | 3.5mmInner Diameter #1: 1.61″ | 41.0mmInner Diameter #2: 1.41″ | 36.0mmOuter Diameter #1: 1.92″ | 49.0mmOuter Diameter #2: 1.83″ | 46.5mm