Brake Center Plate
CTPA-R78430 Replacement Part to Fit:  John Deere For Models: 4000, 4020, 4230, 4320, 4430, 646C, JD570, JD570A, JD644, JD644A, JD644B, JD646, JD646B Use w/ Sunshaft R45779 or R33431. Replaces: R45781, R48476, R45780, R33819. 15.000" Dia., 15 teeth  Price:  $94.99  Buyers Club Price:  $85.49