Manufactured by SPI Includes 2 piston kits, bearings top end gasket kit everything pictured Pistons are for standard bore size 72.00mm SPI pistons are engineered to provide the best possible path for combustion chamber heat transfer to the cylinder walls All pistons, rings, pins, circlips bearings are manufactured to OEM specifications All individual components are interchangeable with original parts Piston weight compatible with original piston Made in Taiwan Fits the following fan cooled models 1997 1998 Polaris 488 Supersport 1992 Polaris 488 Supertrak 1986 1999 Polaris 488 Trail 1988 1995 Polaris 488 Trail Deluxe 1987 1989 Polaris 488 Trail ES 1997 1998 Polaris 488 Trail RMK 1987 1989 Polaris 488 Trail SKS 1989 1991 Polaris 488 Trail Supertrak 1986 / 1988 1989 Polaris 488 Trail SP 1996 1999 Polaris 488 Trail Touring 1993 1997 Polaris 488 WideTrak GT