Manufactured by SPI & Made in Taiwan Includes 2 pistons, ring sets, wrist pins & circlips as pictured All SPI pistons, rings, pins & circlips are manufactured to OEM specifications T-Moly series with Teflon-Molybdenum coating Pistons are for standard bore size 81.00mm Compatible with Arctic Cat models below: 2001 Mountain Cat 800 (Carb) 2001 Mountain Cat 800 LE (Carb) 2001 ZL 800 ESR (Carb) 2001 ZL 800 ESR Illusion (Carb) 2001 ZR 800 (Carb) 2001 ZR 800 LE (Carb) 2002 Mountain Cat 800 (Carb) 2002 Mountain Cat 800 (EFI) 2002 Mountain Cat 800 LE (Carb) 2002 Mountain Cat 800 LE (EFI) 2002 ZL 800 ESR (EFI) 2002 ZL 800 SS (EFI) 2002 ZR 800 (Carb) 2002 ZR 800 Cross Country (Carb) 2002 ZR 800 Cross Country (EFI) 2002 ZR 800 (EFI) 2003 Mountain Cat 800 (EFI) 2003 Pantera 800 ESR (EFI) 2003 ZL 800 ESR (EFI) 2003 ZL 800 SS (EFI) 2003 ZR 800 (EFI) 2003 ZR 800 Sno Pro (EFI) 2004 Mountain Cat 800 (EFI) 2004 Pantera 800 (EFI)