RBC30SET (BRUSH HEATERS). Carburetor Carb Air Filter Kit For Stihl FS45 FS46 FS55 FC55 FS38 HS45 FS74 FS75. 1 x carburetor.2 x mounting gaskets. Type Carburetor. bedding set. Replace part number 308054003, 985624001, 3074504 308054013, 308054012, 308054015.