This is a A-804-3520 Square Bore Implement Yoke (w/ Set Screw) PN: 804-3520Main Description As Following : A-804-3520 Square Bore Implement Yoke (w/ Set Screw) PN: 804-3520 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 35 Series, Driveline > Yokes, Weasler Domestic: 35 Series Associated Items : New Also This is An Aftermarket Product And : 35 Series implement yoke. 1-1/4" square bore with set screw. Original Weasler part. Bore: 1 1/4"