This is a A-101-6720 Yoke, 1 3/4" - 20 Spline w/ Safety Slide Lock PN: 101-6720Main Description As Following : A-101-6720 Yoke, 1 3/4" - 20 Spline w/ Safety Slide Lock PN: 101-6720 Found in Section & Models : Driveline > Yokes, Bondioli & Pavesi 100 Series: Size 7 Associated Items : New Also This is An Aftermarket Product And : Weasler alternative to original part. Bore: 1 3/4" - 20 Spline