I have P7000 255/35/18 s on the rear of my M3. I need a new set. The only problem is I can't tell which of the 7000s on your web site is my tire. The tread pattern looks the same from the pictures on the web site. I don't know if my tires are the P7000 (summer) or P7000 (supersport) is there something on the tire I could check to confirm before I make a mistake that will surely piss me off.