Sixity Auto Parts Coupon Codes, Promo Codes, Deals, 40+ Offers + Fast Free Free Shipping. Sixity Auto Parts automotive aftermarket and developed a line of automotive replacement parts from heavy hitters like Aisin, Dayco, NGK, Gates, Philips, TYC, and more. now sold here on Sixity Auto. Additionally, our auto parts cover all of the most popular cars from Toyota and Honda to Chevy, Dodge, and Ford. With over 200,000 parts in stock from spark plugs and headlights to belts and hoses.