In mid-February 1968, the California Ford Dealers (Ford Dealer Advertising Fund) began to market a factory-built, limited-edition Mustang, called the GT/CS, or "California Special". The hope was for a targeted production run of 5,000, but actually, 4118 were made, which included 251 units that were remarketed in Denver, Colorado, as "High Country Special '68". Production ran for only 5.5 months from mid-February 1968 to early August 1968.

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