Search by number: 1989 Pontiac Optima 1.6L 4 Cyl Alternator ProAmp 7929 $92.00 each OPTIONS: Canada w/AC 4 Pin Plug ProAmp 7954 $112.00 each OPTIONS: Canada wo/AC 1 Pin Plug 1st Prod 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