Search by number: 2012 Chevrolet Colorado 3.7L 5 Cyl Alternator ProAmp 11148 $131.00 each OPTIONS: Valeo type unit 120 Amps 6 Groove Serpentine Belt ProAmp 420682 Call for Price OPTIONS: Valeo type unit 120 Amps 6 Groove Serpentine Belt 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