Search by number: 2005 GMC Full Size Pickups 8.1L 8 Cyl Alternator ProAmp 8247 $114.00 each OPTIONS: Standard 105 Amp ProAmp 8292 $153.00 each OPTIONS: 4 Pin Regulator Plug; Delco unit 145 Amps ProAmpN 8247N $119.00 each OPTIONS: Standard 105 Amp ProAmpN 8292N $163.00 each OPTIONS: 4 Pin Regulator Plug; Delco unit 145 Amps 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