Hmmm. I don't know about the proportions on the two-door. The back half of it seems about 6 inches too short. (assuming it's even based in reality or close)
I daily drive my manual EcoBoost Mustang, in Michigan. Somehow I've been able to keep it out of the ditch for five years, even when I turn the TC off to have a little fun. It's either impossible or it requires... ugh what's the word for it... skill? Nah, that doesn't sound right. Must be...
Ford would never do this, if only for sales numbers reporting. Remember the Freestyle --> Taurus XL debacle? They're not going to make it look like the Mustang is selling less numbers.
I used the license plate instead. Letters on Michigan plates are 1 inch wide. Even though we don't have a lot of image resolution to work with in the first place, it's pretty safe to say that's 2 inches wide.
It'll be interesting if that's final placement. (It probably is, at this point.) If the roof is removable, there's really no place to hide it; in a fin or embedded in the rear window.