https://nationalpetroleum.net/store/manufacturers/fill-rite/fill-rite-rotor-group-kit-for-1200c-2400c-4200d-4400-sd1200-600c-and-sd600-series-pumps/
Fill Rite Rotor Group Kit for 1200C, 2400C, 4200D, 4400, SD1200, 600C, and SD600 Series Pumps