Search by number: 2015 Chevrolet Impala 3.6L 6 Cyl Alternator ProAmp 11453 $143.00 each OPTIONS: Valeo type unit 150 Amps 6 Groove Serpentine Belt ProAmp 11251 $157.00 each OPTIONS: Ndenso Unit; 170 Amps ProAmpN 11453N $342.00 each OPTIONS: Valeo type unit 150 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