Oil in my Radiator

ok, your right the head gasket was done because my mechanic thought that was the fault, there is no milky oil or water mixing with oil in the engine, a thick milky oil only in the radiator and yes the radiator was flushed with degreaser and cleaned.

Where can I find the radiator trans cooling line??? mate your help is very much appreciated especially here in Papua New Guinea (were just above Australia)