This is a A-804-1220 Square Bore Implement Yoke (w/ Set Screw) PN: 804-1220Main Description As Following : A-804-1220 Square Bore Implement Yoke (w/ Set Screw) PN: 804-1220 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 12 Series, Driveline > Yokes, Weasler Domestic: 12 Series Associated Items : New Also This is An Aftermarket Product And : 12 Series Implement Yoke with 1-1/4" Square bore with set screw. Original Weasler part. Bore: 1 1/4"