Aircraft Model(s): 58 Baron. Applicable Engines: IO-550-C, IO-520-C, -CB. 1 - STC Document Set SA10551SC, 2 - 3-Bladed Propellers PHC-J3YF-2UF/FC7391D, 2 - Polished Spinners C-3567-4P. 75 inch diameter 3-bladed "SCIMITAR", aluminum hub propellers.