Standard Hub Part # Hub Kit Part # Description Bearing Size H4S10S100S H4S10S100K Four Bolt Idler Hub Assembly 1” Tapered Roller Bearing H4S13S106S H4S13S106K Four Bolt Idler Hub Assembly 1 1/16” Tapered Roller Bearing H5S10S100S H5S10S100K Five Bolt Idler Hub Assembly 1” Tapered Roller Bearing H5S13S106S H5S13S106K Five Bolt Idler Hub Assembly 1 1/16” Tapered Roller Bearing 1 1/16” and 1 3/8” Tapered Roller H5S17T106S H5S17T106K Five Bolt Idler Hub Assembly Bearing 1 1/4” and 1 3/4” Tapered Roller H5S30T125S H5S30T125K Six Bolt Idler Hub Assembly H4L10S100S H4L10S100K Four Bolt Idler Hub Assembly 1” Tapered Roller Bearing H4L13S106S H4L13S106K Four Bolt Idler Hub Assembly 1 1/16” Tapered Roller Bearing H5L10S100S H5L10S100K Five Bolt Idler Hub Assembly 1” Tapered Roller Bearing H5L13S106S H5L13S106K Five Bolt Idler Hub Assembly 1 1/16” Tapered Roller Bearing 1 1/16” and 1 3/8” Tapered Roller H5L17T106S H5L17T106K Five Bolt Idler Hub Assembly Bearing 1 1/4” and 1 3/4” Tapered Roller H5L30T125S H5L30T125K Six Bolt Idler Hub Assembly Bearing Hub “Kit” Includes: Bearings, Grease Seals, Dust Cap, Cotter Key, Lug Nuts, and PreGreased