Auto parts stores are retail stores with a specialized niche and a defined customer base. They sell products for cars to people who love cars. In the book, "Automotive Chassis," Tim Gilles reminds auto enthusiasts that large department store auto-part chains are in business to make money by peddling "popular items such as oil and filters, windshield wipers, and tune-up items to the (do-it-yourself) market." New auto product manufacturers can take advantage of the auto parts store's relationship with its customers.