Look for the 2 disc sets of each film.
On the second disc it has the original versions of the Star Wars films 4-6. However!
They are NON-ANAMORPHIC and do not have 5.1 sound.
Also Star Wars: Episode IV A New Hope in now just Star Wars. Episode IV: A New Hope was added a year after its original release and has been removed from the DVD release!
I would still have the original versions over the (admittedly) GLOURIOUS LOOKING AND SOUNDING BASTARDISATIONS that are the 2004 DVD releases!