Search by number: 1991 GMC Full Size Pickups 6.2L 8 Cyl Diesel Alternator ProAmp 8165-11 $105.00 each OPTIONS: C K - w/AC Option 105 Amp ProAmp 7802-11 $113.00 each OPTIONS: R V Models ProAmpN 7802-11N $103.00 each OPTIONS: R V Models ProAmpN 8165-11N $123.00 each OPTIONS: C K - w/AC Option 105 Amp ProAmp 7921-11 Call for Price OPTIONS: C K - wo/AC 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