Search by number: 2008 Chevrolet Impala 3.5L 6 Cyl Alternator ProAmp 11185 $137.00 each OPTIONS: Bosch Unit, 125 Amp ProAmpN 11185N $263.00 each OPTIONS: Bosch Unit, 125 Amp 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