Search by number: 1989 Porsche 928 5.0L Alternator ProAmp 13368 $145.00 each OPTIONS: 70 Amp Bosch Unit ProAmp 14956 $151.00 each OPTIONS: 115 Amp Bosch 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