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Manufactured by SPIIncludes 2 piston kits, bearings & top end gasket kit (everything pictured)Pistons are for standard bore size 72.00mmSPI pistons are engineered to provide the best possible path for combustion chamber heat transfer to the cylinder wallsAll pistons, rings, pins, circlips & bearings are manufactured to OEM specificationsAll individual components are interchangeable with original partsPiston weight compatible with original pistonMade in TaiwanFits the following fan cooled models:1997 - 1998 Polaris 488 Supersport1992 Polaris 488 Supertrak1986 - 1999 Polaris 488 Trail1988 - 1995 Polaris 488 Trail Deluxe1987 - 1989 Polaris 488 Trail ES1997 - 1998 Polaris 488 Trail RMK1987 - 1989 Polaris 488 Trail SKS1989 - 1991 Polaris 488 Trail Supertrak1986 / 1988 - 1989 Polaris 488 Trail SP1996 - 1999 Polaris 488 Trail Touring1993 - 1997 Polaris 488 WideTrak GT