Fiat SpA is negotiating compensation from General Motors to settle their dispute over a pledge by the US car maker to buy the Fiat Auto unit, the Italian automaker's chairman said in a French newspaper interview published on Thursday, according to Associated Press (AP). AP said Umberto Agnelli was quoted in financial daily Les Echos as saying that Fiat and GM were in talks over the terms for cancelling a disputed put option that allows Fiat to sell its struggling Auto division to the Detroit-based car maker between 2005 and 2010.