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Looks the same as my Negative clamp but with a different bolt and nut.
The Positive uses a different much more complex clamp.
With a shorter bolt the black plastic cover should fit over it like this one (not my pic, found on Google Image Search)
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.