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There is no difference. You can do it yourself.
I used 6AL-4V titanium with a 1mm thickness. But since your rotora fronts are the same shape as the Stoptech 6piston, you can just buy em from Zeckhausen...precut.
I only use shims on track, so obviously didn't put any disc brake quiet on em. I highly doubt you could ever get the brakes hot enough on the street to necessitate Ti shims. Even if you're doing a canyon run, I presume you won't be running full race pads. Even if you were, you wouldn't be doing the same level of braking as you would on track.
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