Dorman Products Inc is a supplier of replacement parts and fasteners for passenger cars, light trucks, and heavy duty trucks in the automotive aftermarket. It distributes and markets approximately 150,000 different stock keeping units (SKUs) of automotive replacement parts, many of which it designs and engineers. Its products include among other parts, intake manifolds, exhaust manifolds, window regulators, radiator fan assemblies, tire pressure monitor sensors, complex electronics devices, and exhaust gas recirculation (EGR) coolers. Fasteners include such items as oil drain plugs, wheel bolts, and wheel lug nuts. Its products are sold primarily in the United States through automotive aftermarket retailers (such as AutoZone, Advance Auto Parts, and OReilly Auto Parts), national, regional and local warehouse distributors (such as Carquest and NAPA) and specialty markets and salvage yards. It distributes automotive replacement parts internationally, with sales primarily into Europe, Mexico, the Middle East, Asia and Canada. Substantially all of the Companys products are manufactured by third parties. The Company faces competition from automobile manufacturers who sell through their dealerships many of the same replacement parts that the Company sells, although these manufacturers generally sell parts only for cars they produce.