This is a A-102-3521 Quick Disconnect Tractor Yoke PN: 102-3521Main Description As Following : A-102-3521 Quick Disconnect Tractor Yoke PN: 102-3521 Found in Section & Models : Driveline > Yokes, Weasler Domestic: 35 Series Associated Items : A-13002021 Also This is An Aftermarket Product And : Original Weasler part. Bore: 1-3/8" - 21 Spl.