Search by number: 2009 GMC Acadia 3.6L 6 Cyl Alternator ProAmp 11252 $177.00 each OPTIONS: NDenso Unit, 170 Amp ProAmpN 11252N $269.00 each OPTIONS: NDenso Unit, 170 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