Search by number: 1999 Mercedes Benz S Class 6.0L Alternator ProAmp 13710 $210.00 each OPTIONS: Bosch Unit 150 Amp ProAmpN 13710N $267.00 each OPTIONS: Bosch Unit 150 Amp 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