Cook tells us he began selling parts online about two years ago and that it has been very profitable. "About 75 percent of my income comes from online sales, and about 25 percent of those buyers are doing resto mods--V6 to V8 Mustang swaps or modular engines into older cars," he says. He buys from insurance auctions and looks for cars with 75,000 miles or less. "It's hard to sell parts with more mileage than that," Cook says. He sells about 150 parts per month. We first ran across his store searching for Cobra suspension parts.