Manufactured by SPI Includes 2 piston kits, bearings top end gasket kit everything pictured Pistons are for standard bore size 81.00mm 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 Made in Taiwan Fits the following models 2001 Arctic Cat Mountain Cat 800 Carb 2001 Arctic Cat Mountain Cat 800 LE Carb 2001 Arctic Cat ZL 800 ESR Carb 2001 Arctic Cat ZL 800 ESR Illusion Carb 2001 Arctic Cat ZR 800 Carb 2001 Arctic Cat ZR 800 LE Carb 2002 Arctic Cat Mountain Cat 800 Carb 2002 Arctic Cat Mountain Cat 800 EFI 2002 Arctic Cat Mountain Cat 800 LE Carb 2002 Arctic Cat Mountain Cat 800 LE EFI 2002 Arctic Cat ZL 800 ESR EFI 2002 Arctic Cat ZL 800 SS EFI 2002 Arctic Cat ZR 800 Carb 2002 Arctic Cat ZR 800 Cross Country Carb 2002 Arctic Cat ZR 800 Cross Country EFI 2002 Arctic Cat ZR 800 EFI 2003 Arctic Cat Mountain Cat 800 EFI 2003 Arctic Cat Pantera 800 ESR EFI 2003 Arctic Cat ZL 800 ESR EFI 2003 Arctic Cat ZL 800 SS EFI 2003 Arctic Cat ZR 800 EFI 2003 Arctic Cat ZR 800 Sno Pro EFI 2004 Arctic Cat Mountain Cat 800 EFI 2004 Arctic Cat Pantera 800 EFI