This pinion gear housing is compatible with 660 models from 2004 to 2008.It corresponds to part number 5KM-46144-01-00.This component fits the drive shaft assembly for various configurations including the Auto 4x4 Wetland, Hunter Hardwoods, Special Edition, and standard models.Compatible model codes include YFM660FLES, YFM66FABGH, YFM66FAV, YFM66FASEV, YFM66FGW, YFM66FGXGR, YFM66FGXR, YFM66FGHW, YFM66FGX, YFM66FGXL, YFM66FASET, YFM66FAHV, YFM66FAHDV, YFM66FAHWT, YFM660FHSWL, YFM660FS, YFM660FHSW, YFM660FHS, YFM66FGHX, YFM66FAT, YFM66FABGG, and YFM66FAHT.Designed as a direct replacement to restore drivetrain function.