In your other thread several people have suggested grafting in a complete running gear from an Expedition, and that sounds like a fit based on your rear track information. I like the idea of getting an entire vehicle and using the IFS, IRS, engine, tranny, ECU, etc, etc, but I'm not a fan of taking a modern frame and trying to set the body on the new frame. To me that's nothing but a "2005 Expedition with an International body". I prefer seeing the original body and frame, adapting the later running gear into place, but that's just my $0.02.