This is a A-RE29775 Trans Disc: 13.5", Organic, Solid PN: RE29775Main Description As Following : A-RE29775 Trans Disc: 13.5"; Organic, Solid P.N: RE29775 John Deere Transmission Disc 13.5" Organic, solid for tractor 4320.Spline Count: 19Spline Diameter: 1.250" Replaces: ROE29775-RO JOHN DEERE , 5377 JOHN DEERE , Crossed From: SW00403 , , TP-RE29775R , , WN-RE29775 , , WNRE29775 , Found in Section & Models : Clutch Parts > Syncro/Quad Range, John Deere TRACTOR: 4320 Associated Items : New Also A-SMJD203 And : John Deere Transmission Disc 13.5" Organic, solid for tractor 4320. Spline Count: 19 Spline Diameter: 1.250"