Search by number: 2001 Pontiac Montana 3.4L 6 Cyl Alternator ProAmp 13771 $100.00 each OPTIONS: Optional Bosch Unit 125 Amp ProAmp 13770 $110.00 each OPTIONS: Standard Bosch Unit 105 Amp ProAmpN 13771N $249.00 each OPTIONS: Optional Bosch Unit 125 Amp ProAmpN 13770N $265.00 each OPTIONS: Standard Bosch Unit 105 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