I was reading on the net somewhere that Delphi used to be the Delco company.(Delco were bought out and overtaken by another company).Ive no idea how true this info is.
When I replaced my fuel pump I had a look at Holden and ACDelco pumps.
Pulled back the black rubber cover both where Delphi pumps.
Bought the Delco pump got a couple of extra parts in the box and $30 cheaper.