"CSK Auto Corporation is the parent company of CSK Auto, Inc., a specialty retailer in the automotive aftermarket. As of February 3, 2008 the Company operated 1,349 stores in 22 states under the brand names Checker Auto Parts, Schuck's Auto Supply, Kragen Auto Parts, and Murray's Discount Auto Stores."
http://www.cskauto.com/Company.aspx
Just because PartsAmerica lists them, doesn't mean they are all owned by each other. Perhaps this is how they cover the other 28 states?
Anyway, enough arguing... the humor is over. Oreillys is it's own place. As for it's competitors, I'll learn more when I actually start the job.