Search by number: 2004 BMW 525 2.5L Alternator ProAmp 11083 $171.00 each OPTIONS: wo/Air Duct; 150 Amps; Bosch type unit ProAmpN 11083N $382.00 each OPTIONS: wo/Air Duct; 150 Amps; Bosch type unit 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