I agree with JCL. I wouldnt grind them or anything. Just check the lip on the edge of the rotor and thickness. Mine had almost no lip which is why i reused them.

The powerstop ceramics i believe i found on rockauto and then searched p# on amazon as well.

I cant comment on dust yet since ive only had them since thursday and havent driven much.

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2006 X5 4.8is Fully Loaded