Part Number: J5310-01 (Directional gyro assembly)Part Number: J5310-02 (Directional gyro assembly)Part Number: J5310-03 (Directional gyro assembly)Part Number: J5310-04 (Directional gyro assembly)Part Number: RCA11-1 (Directional gyro assembly)Part Number: RCA11-4 (Directional gyro assembly)