A previous post got me thinking, If I bought a set of used rotors off the web how would I tell if I hat 2 left rotors or 2 right rotors? I looked them up on the parts fisch and the part numbers are different. Are they stamped with the part numbers. Mine are behind rotor covers so Ill have to pull my covers to look. Any thoughts from those people who have had their rotors off the rims or have purchased extra front rotors. anyone know what the difference between the rotors are?