Search by number: 2004 Mercury Mountaineer 4.0L 6 Cyl Alternator ProAmp 8519 $110.00 each OPTIONS: 130 Amps; wo/Black Cover ProAmp 7787 $133.00 each OPTIONS: 130 Amps; W/Black Cover ProAmp 7787HD220 $298.00 each OPTIONS: 220 Amp; Custom Built ProAmpN 7787N $182.00 each OPTIONS: 130 Amps; W/Black Cover ProAmpN 8519N $182.00 each OPTIONS: 130 Amps; wo/Black Cover 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