This is a A-R78430 Center Plate, Brake PN: R78430Main Description As Following : A-R78430 Center Plate, Brake P.N: R78430 Use w/ Sunshaft A-R45779 or R33431Dim A (1): 15.000" Dia.Dim B (2): 15 TeethReplaces: R45781, R48476, R45780, R33819 Replaces: A-R45781 JOHN DEERE , A-R48476 JOHN DEERE , A-38B345 JOHN DEERE , Crossed From: AMR78430 , , R33819 JOHN DEERE , R45780 JOHN DEERE , TP-R78430 , , WN-R78430 , , WNR78430 , , 105617 , , 1402-2012 , Found in Section & Models : Transmission & Rear Axle > Brake Related Parts, John Deere INDUSTRIAL/CONSTRUCTION: 570, John Deere INDUSTRIAL/CONSTRUCTION: 570A, John Deere INDUSTRIAL/CONSTRUCTION: 644, John Deere INDUSTRIAL/CONSTRUCTION: 644B (SN 339877>), John Deere INDUSTRIAL/CONSTRUCTION: 646 (SN <223644), John Deere INDUSTRIAL/CONSTRUCTION: 646B (SN <223644), John Deere INDUSTRIAL/CONSTRUCTION: 646C, John Deere SKID STEER LOADER: 570, John Deere TRACTOR: 4230 (SN <015452) Associated Items : New Also A-FRM-JD, A-JD-O-OMR65347, A-JD-S-TM1056, A-SMJD50 And : Use w/ Sunshaft A-R45779 or R33431 Diameter: 15.000" Replaces: R45781, R48476, R45780, R33819 Teeth: 15