Manufactured by SPI 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 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 fan cooled models 1986 Polaris 488 Trail 1986 Polaris 488 Trail SP 1987 Polaris 488 Trail 1987 Polaris 488 Trail ES 1987 Polaris 488 Trail SKS 1988 Polaris 488 Trail 1988 Polaris 488 Trail Deluxe 1988 Polaris 488 Trail ES 1988 Polaris 488 Trail SKS 1988 Polaris 488 Trail SP 1989 Polaris 488 Trail 1989 Polaris 488 Trail Deluxe 1989 Polaris 488 Trail ES 1989 Polaris 488 Trail SKS 1989 Polaris 488 Trail SP 1989 Polaris 488 Trail Supertrak 1990 Polaris 488 Trail 1990 Polaris 488 Trail Deluxe 1990 Polaris 488 Trail Supertrak 1991 Polaris 488 Trail 1991 Polaris 488 Trail Deluxe 1991 Polaris 488 Trail Supertrak 1992 Polaris 488 Supertrak 1992 Polaris 488 Trail 1992 Polaris 488 Trail Deluxe 1993 Polaris 488 Trail 1993 Polaris 488 Trail Deluxe 1993 Polaris 488 WideTrak GT 1994 Polaris 488 Trail 1994 Polaris 488 Trail Deluxe 1994 Polaris 488 WideTrak GT 1995 Polaris 488 Trail 1995 Polaris 488 Trail Deluxe 1995 Polaris 488 WideTrak GT 1996 Polaris 488 Trail 1996 Polaris 488 Trail Touring 1996 Polaris 488 WideTrak GT 1997 Polaris 488 Supersport 1997 Polaris 488 Trail 1997 Polaris 488 Trail RMK 1997 Polaris 488 Trail Touring 1997 Polaris 488 WideTrak GT 1998 Polaris 488 Supersport 1998 Polaris 488 Trail 1998 Polaris 488 Trail RMK 1998 Polaris 488 Trail Touring 1999 Polaris 488 Trail 1999 Polaris 488 Trail Touring