Brakes and ignition componets, always stick with OEM. Measure the discs to check the thickness. If they have a big lip on the outer edge they probably are below the minimum specs (which is stamped on the disc, under the rust). If they look badly discolored with uneven wear patterns, it is time to replace them...

Brake dust? If you don't drive the car very hard then dust shields may be used, but the factory doesn't recommend them because they stop to air flow that keeps the discs cool...

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