It's up to you to figure out which wheel bearings are bad. Listen while driving, jack up the front of the car, and while holding onto the spring with one hand, spin the wheel with the other. If you feel a grinding type of vibration transmitted through the spring, then the wheelbearing is likely bad. Grab the wheel with your hands at the 9o'clock and 3o'clock positions and wiggle it back and forth, any play? do the same at 12o'clock and 6o'clock positions and feel for any play.
If you're still unsure, have a mechanic buddy check it out.
You can buy wheel bearings at any parts store...
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