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 piston T-Moly series with Teflon-Molybdenum coating T-Moly series pistons reduce friction, resist seizure, improve durability Made in Taiwan Pistons are for .010 over bore size 73.25mm Fits 1999 Polaris 550 SuperSport 1999 Polaris 550 Trail RMK 2000 Polaris 550 Sport Touring 2000 Polaris 550 SuperSport 2000 Polaris 550 Trail RMK 2000 Polaris 550 Trail Touring 2001 Polaris 550 Sport Touring 2001 Polaris 550 Sport Touring ES 2001 Polaris 550 SuperSport Edge 2001 Polaris 550 Trail RMK 2002 Polaris 550 Classic F/C 2002 Polaris 550 Sport Touring 2002 Polaris 550 SuperSport 2002 Polaris 550 Trail RMK 2002 Polaris 550 Trail Touring 2003 Polaris 550 Classic Edge 2003 Polaris 550 Sport Touring 2003 Polaris 550 SuperSport Edge 2003 Polaris 550 SuperSport Edge X F/O 2003 Polaris 550 SuperSport M-10 F/O 2003 Polaris 550 SuperSport M-10 X F/O 2003 Polaris 550 Trail RMK 2003 Polaris 550 Trail Touring 2004 Polaris 550 Classic Edge 2004 Polaris 550 Pro X Fan 2004 Polaris 550 Sport Touring 2004 Polaris 550 SuperSport Edge 2004 Polaris 550 SuperSport M-10 2004 Polaris 550 Trail RMK 2004 Polaris 550 Trail Touring 2005 Polaris 550 Classic 2005 Polaris 550 SuperSport 2005 Polaris 550 Trail RMK 2005 Polaris 550 Trail Touring 2005 Polaris 550 Trail Touring Deluxe 2006 Polaris 550 Classic 2006 Polaris 550 SuperSport 2006 Polaris 550 Trail RMK 2006 Polaris 550 Trail Touring 2006 Polaris 550 Trail Touring Deluxe 2007 Polaris 550 LX Edge 2007 Polaris 550 SuperSport Edge 2007 Polaris 550 Trail RMK 2007 Polaris 550 Trail Touring Deluxe 2008 Polaris 550 LX 2008 Polaris 550 SuperSport 2008 Polaris 550 Trail RMK 2008 Polaris 550 Trail Touring 2009 Polaris 550 IQ Shift 2009 Polaris 550 Trail RMK 2009 Polaris 550 Trail Touring 2010 Polaris 550 IQ Shift 2010 Polaris 550 Trail RMK 2010 Polaris 550 Trail Touring 2011 Polaris 550 IQ LXT 2011 Polaris 550 IQ Shift 2011 Polaris 550 Shift 136 2012 Polaris 550 IQ LXT 2012 Polaris 550 IQ Shift 2012 Polaris 550 Shift 136 2013 Polaris 550 IQ LXT 2013 Polaris 550 IQ Shift 2013 Polaris 550 Shift 136 2014 Polaris 550 Indy 2014 Polaris 550 Indy 144 2014 Polaris 550 Indy Adventure 144 2014 Polaris 550 Indy LXT 2014 Polaris 550 Indy Voyager 2015 Polaris 550 Indy 2015 Polaris 550 Indy 144 2015 Polaris 550 Indy Adventure 144 2015 Polaris 550 Indy Adventure 155 2015 Polaris 550 Indy LXT 144 2015 Polaris 550 Indy Voyageur 144 2015 Polaris 550 Indy Voyageur 155