Search by number: 2010 Mercedes Benz S550 5.5L 8 Cyl Alternator ProAmp 11220 $235.00 each OPTIONS: 4Matic; Exc.High Capacity; 180 Amps ProAmp 11305 $260.00 each OPTIONS: High Capacity ProAmp 11310 $281.00 each OPTIONS: 4Matic; High Capacity (To Chassis/VIN A 322942) ProAmp 11444 Call for Price OPTIONS: 4Matic; High Capacity (From Chassis/VIN A 322943) 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