THIS KIT INCLUDES THREE SPINDLES, THREE BLADES, AND A BELT. THE BLADES REPLACE PART NUMBERS 21546235, 187254, 187256, 33954, 532187256, 574292401, 575938401, 917187254, 532187254, 532187256, 539112053, 777187256, 539112053, 574292401, 575938401. THE SPINDLES REPLACE PART NUMBERS 21546238, 21546299, 21549012, 187292, 192870, 532192870, 587125401, 532187281, 532187292, 532192870, 539112057, AND 532192870. AND THE BELT REPLACES 539114557. WORKS WITH RZ5424, RZ5426, RZ5422, RZ54I, AND Z254. PLEASE EMAIL US YOUR MOWER MODEL NUMBER IF YOUR NOT SURE THIS KIT WILL WORK FOR YOU.Warning:Lead-Nickel-Cancer and Reproductive Harm