Manufactured by SPI Includes 2 pistons, ring sets, wrist pins, & circlips as pictured SPI pistons are engineered to provide the best possible path for combustion chamber heat transfer to the cylinder walls All SPI pistons, rings, pins, & circlips are manufactured to OEM specifications All individual components are interchangeable with original parts Piston weight is compatible with original pistonT-Moly series with Teflon-Molybdenum coating T-Moly series pistons reduce friction, resist seizure, & improve durability Made in Taiwan Pistons are for standard bore size 72.00mm Fits: 1997 Polaris 500 Classic Touring 1997 Polaris 500 RMK 1998 Polaris 500 Classic Touring 1998 Polaris 500 RMK 1998 Polaris 500 Widetrak LX 1999 Polaris 500 Classic Touring 1999 Polaris 500 RMK 1999 Polaris 500 Widetrak LX 2000 Polaris 500 Classic Touring 2000 Polaris 500 Widetrak LX 2001 Polaris 500 Widetrak LX 2002 Polaris 500 Widetrak LX 2003 Polaris 500 Widetrak LX 2004 Polaris 500 Widetrak LX 2005 Polaris 500 Widetrak LX 2006 Polaris 500 Widetrak LX 2007 Polaris 500 Widetrak LX 2008 Polaris 500 Widetrak LX 2009 Polaris 500 Widetrak LX 2010 Polaris 500 Widetrak LX 2011 Polaris 500 Widetrak LX