Manufactured by SPI Includes 2 pistons, ring sets, wrist pins, bearings, circlips, full gasket kit 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 SPI complete gasket kits contain all gaskets pictured to rebuild an engine, including oil seals with stainless steel springs for maximum performance and corrosion resistance. Made in Taiwan Pistons are for standard bore size 78.00mm ***Pistons are for A case motors and have a 20mm wrist pin*** Fits 1998 Arctic Cat Powder Special 600 L/C 1998 Arctic Cat Powder Special 600 L/C EFI 1998 Arctic Cat Powder Special 600 L/C EFI LE 1998 Arctic Cat ZR 600 L/C 1998 Arctic Cat ZR 600 L/C EFI 1998 Arctic Cat ZR 600 L/C EFI LE 1998 Arctic Cat ZR 600 L/C EFI LE XC 1999 Arctic Cat Powder Special 600 L/C 1999 Arctic Cat Powder Special 600 L/C EFI I 1999 Arctic Cat Powder Special 600 L/C EFI II LE 1999 Arctic Cat ZL 600 L/C 1999 Arctic Cat ZL 600 L/C EFI 1999 Arctic Cat ZR 600 L/C 1999 Arctic Cat ZR 600 L/C EFI 1999 Arctic Cat ZR 600 L/C EFI LE 1999 Arctic Cat ZR 600 L/C LE