I went to autozone, they were 3 for $10. Right next door was Radio shack, and I got two individual lights for $2.00 each. They are rated at 15mah and 12 volts, but should work at 6.

Voltwatch for me is a waste of money now as I have a 6v regulated system. My battery could be dangerously dead and I'd still get full bars on the voltwatch (but thanks for the suggestion).