This is a A-501-1400 Spline Slip Sleeve (w/ Grease Reservoir) PN: 501-1400Main Description As Following : A-501-1400 Spline Slip Sleeve (w/ Grease Reservoir) PN: 501-1400 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 14 Series Associated Items : New Also This is An Aftermarket Product And : Original Weasler part. Bore: 1" x 1-1/8" Fits Tube: 2" (.083 Wall) Length: 5"