Replacement Upper Buffer Wheel Agitator for Cosmo fertilizer spreaders, models P & PX 180, 250, 300, 400, 500, 410, 610, 1010. These agitator mounts via an included hex bolt to the Entrainer located in the hopper of the spreader. We sell all of the replacement parts for the Cosmo fertilizer spreaders. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. Part Numbers: 619.004 We stock a wide variety of replacement parts for Agricultural Equipment please contact us if you have any questions or if you would like more information.