Search by number: 2005 Chevrolet Impala 3.8L 6 Cyl Alternator ProAmp 11045 $96.00 each OPTIONS: Bosch Unit Standard ProAmp 13771 $100.00 each OPTIONS: Bosch Unit Police Option or Special Equipped ProAmpN 11045N $246.00 each OPTIONS: Bosch Unit Standard ProAmpN 13771N $249.00 each OPTIONS: Bosch Unit Police Option or Special Equipped 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