Search by number: 2013 BMW 335i 3.0L 6 Cyl Alternator ProAmp 42029 Call for Price OPTIONS: Sedan; 210 Amps; wo/Clutch Pulley ProAmp 42031 Call for Price OPTIONS: Coupe; Convertible; 170 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