This is a A-71138279 Trans Disc: 10", organic, rigid PN: 71138279Main Description As Following : A-71138279 Trans Disc: 10", organic, rigid P.N: 71138279 Spline Count: 10Spline Diameter: 1.375" Stocked As: A-100719 Found in Section & Models : Tractor Parts Associated Items : New Also This is An Aftermarket Product And : Spline Count: 10 Spline Diameter: 1.375"