To be honest, I dont know what type or voltage, but I do know Supercheap stock them, they'll be able to advise.
Printable View
I got my LEDs (and other parts) on line from Bright Light auto parts (Bright Lights Auto Parts - Welcome to the home of Bright Lights Auto Parts) when I added my front bar. Cheap, quick delivery.
BTW, the extra lights in the bar don't increase the resistance, they increase the current. The resistance actually decreases.