Search by number: 2014 Ford Mustang 3.7L 6 Cyl Alternator ProAmp 11623 $172.00 each OPTIONS: 150 Amps. Automatic Transmission ProAmp 11621 $182.00 each OPTIONS: 150 Amps. Manual Transmission Why is there more than one unit for my car? Look at the TECH SPECS when more than one unit is shown for your car. AMPS (ELECTRIC CAPACITY): must match you vehicle electric requirements. *** Call us if you are looking to increase your unit capacity! OE ALTERNATOR MANUFACTURER: It is recommended to match the Make of your alternator