Question about rear brakes for 02 CLK55



I have a 2002 CLK55 and need rear brakes. Last 2 times I had the car in for work I was told they would be needed very soon. They are squeaking more and more (fronts were done a year ago) and I'm ready to buy. I was planning to buy the parts and take it to an independent shop. My question is about brands.
I've bought parts from AutohauzAz.com before and when I search for rear rotors it comes back with "ATE" and they are $66 each. AutohauzAz.com says they stock OEM.
Are these OEM? Searching other sights comes up with similar finds. Same prince range but different brands.
Here is the link-
Thanks
http://www.autohausaz.com/search/pro.../Brake%20Rotor



