Aircraft Model(s): 55 Baron. Applicable Engines: IO-520-C, IO-520-CB. 2 - 3-Bladed Propellers PHC-C3YF-2UF/FC7663-2R, 1 -STC Paperwork SA773CE, 2- Polished Spinners C-3567-1P. 76 inch diameter 3-bladed, aluminum hub propellers.