This pinion gear housing is compatible with 660 models from 2004 to 2008.It corresponds to part number 5KM-46144-01-00 and is designed for use in quad and go-kart applications involving the drive differential system.This component fits various configurations including the 2004 660 AUTO 4X4 WETLAND (YFM660FLES, YFM660FHSWL, YFM660FHSW, YFM660FS, YFM660FHS), 2005 660 (YFM66FAT), 2005 660 SE (YFM66FASET), 2005 660 HUNTER (YFM66FAHT), 2005 660 HUNTER WETLAND (YFM66FAHWT), 2006 660 HUNTER HARDWOODS (YFM66FABGH, YFM66FAV, YFM66FABGG), 2006 660 SPECIAL EDITION (YFM66FASEV), 2006 660 EDITION (YFM66FAHDV), 2006 660 HUNTER HARDWOODS HD CAMO (YFM66FAHV), 2007 660 (YFM66FGW), 2007 HUNTER (YFM66FGHW), 2008 660 (YFM66FGXGR, YFM66FGXR, YFM66FGX, YFM66FGXL), and 2008 660 HUNTER (YFM66FGHX).The item serves as a replacement for the drive shaft assembly housing to restore equipment function.