Search by number: 1991 Chevrolet Astro Van 4.3L 6 Cyl Alternator ProAmp 8165-3 $98.00 each OPTIONS: Standard Alternator with or with out AC 105AMP ProAmpN 8165-3N $113.00 each OPTIONS: Standard Alternator with or with out AC 105AMP 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