Search by number: 2005 Mercury Marquis 4.6L 8 Cyl Alternator ProAmp 8313 $121.00 each OPTIONS: Standard 130 Amps 4GHO; PCM controlled; Plug 339 ProAmpN 8313N $182.00 each OPTIONS: Standard 130 Amps 4GHO; PCM controlled; Plug 339 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