This is a A-102-1221 Quick Disconnect Tractor Yoke PN: 102-1221Main Description As Following : A-102-1221 Quick Disconnect Tractor Yoke PN: 102-1221 Found in Section & Models : Driveline > Yokes, Weasler Domestic: 12 Series Associated Items : A-13002021 Also This is An Aftermarket Product And : Original Weasler part. Bore: 1-3/8" - 21 Spline