Search by number: 1990 Geo Storm 1.6L Alternator ProAmp 7949 $51.00 each OPTIONS: Delco Unit w/MT ProAmp 13391 $61.00 each OPTIONS: NDenso Unit Option ProAmp 7968 $112.00 each OPTIONS: Delco Unit w/AT ProAmpN 13391N $145.00 each OPTIONS: NDenso Unit Option 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