Part Number: 0-0641623-1 (Polarization key)Part Number: 01C0A507RP14-1 (Polarization key)Part Number: 163-198225-00 (Polarization key)Part Number: 617980031 (Polarization key)Part Number: GAU7-014-014 (Polarization key)Part Number: NSA938999-02378 (Polarization key)