This is a A-D551120 Safety Slide Lock Tractor Yoke PN: D551120Main Description As Following : A-D551120 Safety Slide Lock Tractor Yoke P.N: D551120 55 Series Safety Slide Lock Tractor Yoke. 1-3/4" 20 Spline Yoke.Bore: 1 3/4" - 20 spline Replaces: AH93918 JOHN DEERE , D551020 DRIVELINE , PM101-5520 *** NO CLASS *** , PM102-5520 *** NO CLASS *** , PM110-5520 JOHN DEERE , A-VTR3115 MISCELLANEOUS , 101-5520 DRIVE-LINE , 1015520 DRIVE-LINE , 102-5520 DRIVE-LINE , 110-5520 DRIVE-LINE , 55-9320 NEAPCO , 55N28020 RIVERSIDE TRACTOR , A-700720113 CASE/INTERNATIONAL HAR. , Crossed From: W1015520DS CASE-IH , W1025520DS CASE-IH , W1105520DS CASE-IH , 55N102-5520 , , 55N280-20 , , 6713-25213 JOHN DAY , 6713-26213 JOHN DAY Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 55 Series, Driveline > Yokes, Weasler Domestic: 55 Series Associated Items : New Also This is An Aftermarket Product And : 55 Series Safety Slide Lock Tractor Yoke. 1-3/4" 20 Spline Yoke. Genuine alternative to original part. Bore: 1 3/4" - 20 spline