Those drivers automatically detect the necessary voltage and current for the lights, right?
No, only one of those and not automatically the necessary, but the one you bought. A constant voltage source fixes the voltage it is specified for and the current is defined by the load. A constant current source fixes the current it is set for and adjusts the voltage to the load.
The latter is what you want.
Chiagrin is right about not putting LEDs in parallel. The constant current driver he suggested does not have enough power, though. Go for the ones I suggested.
You CAN, BTW, always choose a lower constant current and get less brightness with slightly better efficiency. Brightness is roughly proportional to the current. So if you can get your hands on a 350mA source with enough power, you can use that.
If you do not care for efficiency, then you CAN use a current limiting resistor. However, you will need more than 12V. If you take 16V, for example, you need a resistor that drops 4V at 500mA, so you need 8 Ohm. However, 2W will be dissipated there, so you cannot use any resistor. Those are available and could work for what you want. I would put 2x 4Ohm/2W in series, though, AT LEAST. It is definitely not enough to just match the rating. Also, since it is questionable that you have a 16V supply lying around, that is probably not the way to go.
If you choose much less, the resistor will not sufficiently protect your LED.
Also, don't expect to get full (or even matching between different bars) brightness, if you cannot adjust the resistance properly.