Search by number: 1991 BMW 850 5.0L Alternator ProAmp 13320 $153.00 each OPTIONS: 850i / 850Ci Only - Auxiliary Alt ProAmp 13269 $191.00 each OPTIONS: 850i 850Ci Only - 140 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