"mx321-2 = mx321-tm (genuine)" — This listing is an automatic voltage regulator (AVR) for synchronous generators. Key model(s): MX321-2, MX321-TM, MX321. Options include: MX321-2=MX321-TM (Genuine), MX321 (Aftermarket Standard), MX321 (Aftermarket High Quality), MX321 (Aftermarket red capacitor), MX321-2 (Aftermarket Standard), MX321-2 (Aftermarket High Quality), MX321-2 (Aftermarket red capacitor) (7 SKUs). Genuine and aftermarket options are available; choose by site requirements. Confirm alternator brand, power class, and connectors before ordering. Compatibility: Automatic Voltage Regulator (AVR) (avr) Configuration: 7 options available Availability: Contact us for current lead time and bulk pricing. Specifications (from catalog): Type: AVR Brand: partsofgenerator Configuration options: MX321 (Aftermarket Standard), MX321 (Aftermarket High Quality), MX321 (Aftermarket red capacitor), MX321-2 (Aftermarket Standard), MX321-2 (Aftermarket High Quality), MX321-2 (Aftermarket red capacitor) SKU count: 6