Manufactured by SPI Pistons are for standard bore size 85.00mm SPI pistons are engineered to provide the best possible path for combustion chamber heat transfer to the cylinder walls All pistons, rings, pins and circlips are manufactured to OEM specifications All individual components are interchangeable with original parts Piston weight compatible with original piston Contains all gaskets pictured to rebuild top end oil seals not included Made in Taiwan T-Moly series pistons additional benefits Machined smooth heads MOS2 Teflon-molybdenum coating Hard anodized crowns Hypereutectic cast Fits the following models 2000 Polaris 800 RMK 2001 Polaris 800 LE 2001 Polaris 800 RMK 144 2001 Polaris 800 RMK 151 2001 Polaris 800 RMK SP 144 2001 Polaris 800 RMK SP 151 2001 Polaris 800 XC SP 2002 Polaris 800 RMK 144 F/O 2002 Polaris 800 RMK 144 F/O Stock 2002 Polaris 800 RMK 151 F/O 2002 Polaris 800 RMK 151 F/O Stock 2002 Polaris 800 RMK 156 F/O 2002 Polaris 800 XC SP F/O 2002 Polaris 800 XC SP F/O M-10 2002 Polaris 800 XC SP Stock 2003 Polaris 800 Classic Touring 2003 Polaris 800 Pro X 2003 Polaris 800 RMK 144 F/O 2003 Polaris 800 RMK 144 Stock 2003 Polaris 800 RMK 151 F/O 2003 Polaris 800 RMK 151 Stock 2003 Polaris 800 RMK 159 F/O 2003 Polaris 800 RMK 159 Vertical Escape 2003 Polaris 800 XC SP Edge 2003 Polaris 800 XC SP Edge M-10 F/O 2003 Polaris 800 XC SP Edge X F/O 2003 Polaris 800 XC SP Edge X M-10 F/O 2004 Polaris 800 Classic 2004 Polaris 800 Classic Touring 2004 Polaris 800 Pro X 2004 Polaris 800 Pro XR 2004 Polaris 800 RMK 2004 Polaris 800 Switchback 2005 Polaris 800 Edge Touring 2005 Polaris 800 RMK 2005 Polaris 800 Switchback 2005 Polaris 800 XC SP Edge 2005 Polaris 800 XC SP M-10