Real GTS or not.

Ok a lot of information to take in. I'm writing it down and doing the research. I just don't want to leave the GTS badging on the exterior if its not the real deal. But like I said no interior badging to be found. Does the Kelsey hayes brakes make any sense that they would be on a GTS or did they come on other models as well? Also got crazy left hand lug nuts. Whats up with that?