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General Motors Corp., Delphi Corp. and the United Auto Workers are at odds over wages and proposed Delphi plant closings in talks to reach a labor agreement before a critical court hearing on Aug. 11, a union official said Wednesday. Failure to reach an agreement would raise the chances of a strike at Delphi that could cripple GM, which spun off the now-bankrupt auto parts-maker in 1999 and depends on it as the main supplier of thousands of components such as steering columns and air conditioners.