My observation over many years; 1968 Mustang/Shelby's assembled at the Metuchen NJ plant had the nuts on the inboard (engine) side. Dearborn and San Jose built 1968 Mustangs had the nuts outboard. Just one of the many differences between the 3 assembly plants. I have no idea why Metuchen did it that way, but that is the way they did it.
Rodney