CSK ProShop Named Preferred Supplier to Big O Tires

PHOENIX, March 29 -- CSK Auto Inc., wholly-owned subsidiary of CSK Auto Corporation , announced today that Big O Tires Inc. has chosen CSK's ProShop wholesale division as a "Preferred Supplier" for its automotive and light truck parts and accessories. This association combines the attributes of both companies, thus enhancing the buying power and service levels for the majority of Big O Tires' 568 locations.

CSK ProShop, the commercial sales component of CSK Auto Inc., is a major wholesale supplier of automotive parts and accessories, serving automotive professionals throughout the West and Midwest, Alaska and Hawaii. CSK's ProShop centers are focused exclusively on the sale and delivery of parts to wholesale garages, national repair chains, traditional repair shops, and government and fleet maintenance organizations.

"Big O Tires is a well respected organization in our markets and we are pleased to form this partnership to solidify an already successful alliance," said Greg Livingston, VP of CSK ProShop Sales & Marketing.

CSK Auto, Inc. is a specialty retailer in the automotive aftermarket. As of January 30, 2005, CSK operated 1,134 stores in 19 states under the brand names Checker Auto Parts, Schuck's Auto Supply and Kragen Auto Parts.