This is a A-101-3521 Safety Slide Lock Tractor Yoke PN: 101-3521Main Description As Following : A-101-3521 Safety Slide Lock Tractor Yoke PN: 101-3521 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 35 Series, Driveline > Yokes, Weasler Domestic: 35 Series Associated Items : A-13004000 Also This is An Aftermarket Product And : 35 Series Safety Slide Lock Tractor Yoke. Yoke has 21, 1-3/8" Spline. Original Weasler part. Bore: 1 3/8" - 21 Spl. Series: 35R/2200 Type: Slide Collar