Had a slight warp in one front and one rear rotor on my 03 E55. After I cut all four on my brake lathe, I noticed that both front rotors are the same andboth rear are the same as well . Both the drill pattern and the internal directional vents are identical and should be for the left side (counterclockwise rotation) only. Thinking the factory put four left rotors on, I headed down to my local dealer. EveryAMG I saw with drilled rotors was the same! I was told there was only one part # for the front and one for the rear. I couldn't believe my eyes and ears. How does Mercedes get away with putting a directional rotor on the wrong side of the car? Porsche, BMW, Corvette- and any aftermarket big brake setup- they all have a right and leftdue tothe internallyangled cooling vanes. Spinning them in one direction increases cooling airflow, while spinning in the opposite direction the air flow is less.That would explain why justmy right side rotors were warped. Does anybody have any insight? Any Mercedes techs had to explain this before? Is this German engineering at its finest or were these rotors made in China???