The autos I saw had a thicker axle on one side. There were 2 cars the same setup, side by side. The other side was same as my '93 LX 5oh.
Now the '89 5 spd SC I just scrapped has a very fat axle on the passenger side and a driver side axle much larger than the LX.
The MarkVIII axles in my car are the exact same skinney ones as a '93 LX.
I just found the charger for my camera after moving and will snap some pics to show the difference.
Just out of curiousity, what is the purpose for a larger shaft on one side? To even out the traction or to reduce harmonics would be my guess.