This is a A-101-8406 Tractor Yoke, 1 3/8" - 6 Spline w/ Slide Collar PN: 101-8406Main Description As Following : A-101-8406 Tractor Yoke, 1 3/8" - 6 Spline w/ Slide Collar PN: 101-8406 Found in Section & Models : Driveline > Driveline Components, Bondioli & Pavesi 100 Series: Size 4, Driveline > Yokes, Bondioli & Pavesi 100 Series: Size 4 Associated Items : New Also This is An Aftermarket Product And : Weasler alternative to original part. Bore: 1 3/8" - 6 Spline