The shop.OReillyAuto.com Team includes Checker Auto Parts, Schuck's Auto Supply, Kragen Auto Parts and CSK Auto, Inc., some of the largest auto part retailers in the U.S. This allows us to offer you a superior shopping experience: Thousands of locations throughout the U.S. to give you better pick-up and return options Immediate access to 1 million parts and over $1 billion in inventory The expertise of thousands of auto parts professionals To learn more, click on the logos below.