Hi Griz, When I did mine, I decided to go up alittle in size. That helps to keep the voltage up and helps to keep the battery charged. So I bought mine from either Jegs Performance or Summit. Can't remember which. They sell pretty much the same " kit. " This is what most custom, hot rodders & drag racers use when they are building a car. I believe the wire size was # 2 AWG, stranded copper, with super tough insulation. The coil of wire that came with the kit was about 20 feet long. You can press your own ends on it and strap it to the chassi in the original location.