Brakes don't come to rim size the problems that come are when you upgrade to a bigger disk. I've done the fronts on mine dimpled and grooved. I also had a full set on my IS200, all discs and supplied by mtec. I went on their site and there was two different pad styles, gave them a call and they told me which set to go for, and they were bang on. I think I only went for mintex pads £22 ish with mtecs own disc I think they may have been £72 but they work really well together and everyone complained about mintex squeal but I haven't had an issue at all
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