C4ZA-3590-A Early 1967 Steering box pitman arm with 1 inch sector shaft. Power steering only, used with SMB-E steering box. Fits early 1967 Mercury Cougar and 1965- early 1967 Ford Mustang. Ford part number C5ZZ-3590-A. Caution, measure your steering box sector shaft, many of the short boxes have been changed to the 1-1/8 inch boxes.