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 standard bore size 72.00mm Fits: 1989-2006 Polaris 500 (Indy, Carb, EFI, Edge) 1989-2002/2004-2006 Polaris 500 Classic 1993-1994/1996/2001-2003 Polaris 500 Classic Touring 1996 Polaris 500 RMK EFI & Carb 1989-1992/1995-1997 Polaris 500 SKS 1993-1996 Polaris 500 SKS EFI 1990-1992 Polaris 500 SP / SP EFI 1997-1998 Polaris 500 Super Sport 1992 Polaris 500 Supertrak 1985-1999 Polaris 500 Trail 1988-1995 Polaris 500 Trail Deluxe 1987-1989 Polaris 500 Trail ES 1997-1998 Polaris 500 Trail RMK 1987-1989 Polaris 500 Trail SKS 1986/1988-1989 Polaris 500 Trail SP 1992 Polaris 500 SPX 1989-1991 Polaris 500 Trail Supertrak 1996-1999 Polaris 500 Trail Touring 1991-1993 Polaris 500 Widetrak 1993-1996 Polaris 500 Widetrak GT 1994-1996 Polaris 500 Widetrak LX 1990 Polaris 500 Widetrak Trail