I am also interested in this subject. "25 Foot rolls of wire offered in all of the popular gauge sizes and colors (including hard-to-find stripes)" is what the catalog at M&H Electric Fabricators says. I bought an HEI power wire kit made by them, and now looking at their catalog for other stuff. Starting on page 52
http://www.wiringharness.com/PDFS/TR...hevy_Truck.pdf