I've searched through a number of posts that indicate a vertical difference of 1/2" between the mounting of the MII and late Mustang rack. I believe there is also a 1/2" horizontal difference in the mounting (MII is 16" on center, late Mustang is 15 1/2" on center).
It would seem that offset bushings might accomodate the horizontal or vertical mount but not both, risking introducing bumpsteer. Has anyone done this conversion (MII to late model) and if so did you run into any problems? My MII rack has a 4 1/2 lock-to-lock, which seems slow, whereas the late racks are closer to 3 3/4. Any thoughts or suggestions?