Like grown children badgering their parents for handouts, auto-parts companies Delphi and Visteon keep turning up on the doorsteps of GM and Ford. Spun off from General Motors Corp. ( GM ) in 1999, Delphi Corp. ( DPH ) is now threatening to file for bankruptcy court protection by Oct. 17 if it doesn't get a truckload of GM's money and union concessions. And Visteon Corp. ( VC ), spun off by Ford Motor Co. ( F ) the year after, is dumping 24 mostly money-losing plants on Ford this month as part of its second bailout in two years.