Search by number: 2013 Chevrolet Express 2500 6.6L 8 Cyl Alternator ProAmp 8550 $149.00 each OPTIONS: Delco Remy type unit 145 Amps 6 Groove Serpentine Belt Single Alt System ProAmp 11364 $153.00 each OPTIONS: Bosch type unit 105 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