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You have to differentiate between released with a stereo track and retrofitted with a stereo track. Things like DAY THE EARTH STOOD STILL and 7TH VOYAGE are remixes made from the stereo music sessions with panned dialog and effects, but never actually played theaters in stereo.

HOUSE OF WAX played most big cities in stereo and was the first time outside of THIS IS CINERAMA! that most people in the country heard true stereo in a theater. When CinemaScope was first installed in theaters, they were contractually obligated to install stereo, too. This was dropped in the summer of 1954, but by then, many places had it installed, so if a film was in CinemaScope/stereo, chances are that a number of those houses played films such as FORBIDDEN PLANET and THE FLY as 4-track.

Most 3-track stereo tracks are lost. IT CAME is a rare exception. HOUSE OF WAX has been remixed for the DVD using the existing surround track and potpanning the LCRs.

Here is a pretty complete list of genre films from the '50s:

HOUSE OF WAX (WarnerPhonic - 3 Track Mag with optical surround)
5,000 FINGERS OF DR. T (3 Track)
IT CAME FROM OUTER SPACE (3 Track)
SCARED STIFF (3 Track)
ROBOT MONSTER (the pressbook claims it was available in 3-Track—I've found trade mentions is was mixed, but highly doubt it was really available this way)
WAR OF THE WORLDS (3 Track)
20,000 LEAGUES UNDER THE SEA (4-Track)
THIS ISLAND EARTH (Perspecta)
INVASION OF THE BODY SNATCHERS (Perspecta)
FORBIDDEN PLANET (4-Track and Perspecta)
WORLD WITHOUT END (Perspecta)
THE MYSTERIANS (Perspecta in Japan)
THE H-MAN (Perspecta in Japan)
SATELLITE IN THE SKY (4-Track)
THE FLY (4-Track)
THE WORLD, THE FLESH, AND THE DEVIL (4-track)
JOURNEY TO THE CENTER OF THE EARTH (4-track)

The last time I checked (which was after the DVD came out), the 3.0 on WAR OF THE WORLDS is still lost and the stereo track on the DVD was a faux-job by Chace Audio.

All of the Perspecta tracks have the stereo effect encoded into the track. With the proper know-how and equipment, an accurate transfer could be made of any of them.