Search by number: 2013 Chevrolet Camaro 3.6L 6 Cyl Alternator ProAmp 11787 $182.00 each OPTIONS: 1st prod 140 amps ProAmpN 11787N $259.00 each OPTIONS: 1st prod 140 amps 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