UPDATE 1-Delphi buys GM, PBGC stakes for $4.4 bln

Delphi buys Class A interests from GM for $3.8 bln * Delphi buys Class C interests from PBGC for $594 mln DETROIT, March 31 Delphi purchased Class A interests owned by GM for $3.8 billion. It also bought the PBGC's Class C interests for $594 million...