There is one other way to tell if it's a true Cobra II t-top. Every t-top II has that vinyl "targa band" that runs over the top of the car behind the doors and the tops - EXCEPT the Cobra II. That was in order to continue to use the quarter window louvers. Ford never made cut-down louvers like you see on a lot of t-top cars now, those are longer ones modified by the owner.
That's not to say an owner couldn't delete the targa band, I've seen that too...