Hi Leo,
If you have the radio, try looking on the underside as there may be an info label stating the required speaker impedance. I would NOT add a resistor in series with an 8 ohm driver as it's just lost energy. You could series connect two 8 ohm drivers, but what size is the car's speaker? I'm thinking probably somewhere in the 5 to 8 inch range. I would simply look for a suitably sized 16 ohm full range driver. You probably won't find one new, but used should be easy enough.
Is it one or 2 speakers required? Anyway, if it were me I would try to find a NOT INEXPENSIVE and chunky, JBL LE8 full range driver, given that 8 inch is suitable. With only a few watts output, I think I read 8 watts, you'd want a driver with good /high sensitivity.
Best
JA
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