One concern for both G.M . and the union is the bankruptcy filing earlier this month of Delphi , the supply giant that was once a division of G.M . Delphi 's chief , Robert S. Miller , has said he needs steep concessions from the union and a multibillion-dollar rescue package from G.M . Delphi is seeking wages as low as $ 10 an hour , a cut of more than 50 percent .