RE: What's the difference between FN10 and MN12?
FN10 was an exclusive number given to Mark VIII's. MN12's were given to the T-birds. All the suspension parts, engine parts, ect will bolt up between the two. I beleive there are only small differences in the dash area. ALl of which were made so mark VIII specific parts could easily be installed. As far as I know they are the exact same initial platform.