2004 Ford F Series Trucks Catalytic Converter CARB Approved F-150 - 5.4L Engine - 4WD - Engine Number 4FMXT05.4RPB - Rear Left guaranteed to replace your current 2004 Ford F Series Trucks Catalytic Converter CARB Approved F-150 - 5.4L Engine - 4WD - Engine Number 4FMXT05.4RPB - Rear Left. 2004 Ford F Series Trucks Catalytic Converter CARB Approved comes new OEM 2004 Ford F Series Trucks Catalytic Converter CARB Approved aftermarket new 2004 Ford F Series Trucks Catalytic Converter CARB Approved of remanufactured 2004 Ford F Series Trucks Catalytic Converter CARB Approved F-150 - 5.4L Engine - 4WD - Engine Number 4FMXT05.4RPB - Rear Left.