Dorman Products, Inc. is a supplier of replacement and upgrade parts in the motor vehicle aftermarket industry, serving passenger cars, light, medium, and heavy-duty trucks, as well as specialty vehicles, including utility terrain vehicles and all-terrain vehicles. Its segments include Light Duty, Heavy Duty, and Specialty Vehicle. The Light Duty segment designs and markets replacement parts and fasteners primarily for passenger cars and light trucks with sales to retailers and wholesale distributors who primarily serve passenger car and light truck customers. The Heavy Duty segment designs and markets replacement parts primarily for medium and heavy trucks with sales to independent distributors, independent component specialists and rebuilders, and auto parts stores that focus on the heavy-duty market. Specialty Vehicle segment designs, markets, and manufactures aftermarket parts and accessories for the powersports market with sales through direct-to-consumer, dealers, and installers.