This is a A-AT113423 Trans Disc: 11" PN: AT113423Main Description As Following : A-AT113423 Trans Disc: 11" P.N: AT113423 Replaces: AT21066Spline Count: 10Spline Diameter: 1.250" Replaces: AT21066 JOHN DEERE Found in Section & Models : Clutch Parts > Single Clutch, John Deere TRACTOR: 2010, Clutch Parts > Steering Clutch, John Deere INDUSTRIAL/CONSTRUCTION: 2010, John Deere INDUSTRIAL/CONSTRUCTION: 450B Associated Items : New Also This is An Aftermarket Product And : Replaces: AT21066 Spline Count: 10 Spline Diameter: 1.250"