Sold one by one with 2 nuts. 1964-66 Mustang. 1964-65 Falcon. Length: 5.0 "(Approx: 127 mm). C - C: 2.67 "(Approx: 67.83 mm). Inside dimensions: Approx: 57.3 mm. Thread: 7/16 "-20. Length of thread = Approx: 35 mm.