This is a A-101-4420 Safety Slide Lock Tractor Yoke PN: 101-4420Main Description As Following : A-101-4420 Safety Slide Lock Tractor Yoke PN: 101-4420 Found in Section & Models : Driveline > Yokes, Weasler Domestic: 44 Series Associated Items : A-13004020 Also This is An Aftermarket Product And : 44 Series Safety Slide Collar Tractor Yoke. 1-3/4" bore 20 spline Yoke. Original Weasler part. Bore: 1 3/4" - 20 Spl.