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The Alcon Pro‑System replacement rotor for Brembo 12‑bolt D bobbin mounting (DIV4212C) is the left‑side unit sized 328x42x64mm, specified to match that mounting pattern. Provided as a direct replacement, it restores correct rotor diameter, thickness and bobbin mounting interface on the left side where a DIV4212C‑style Brembo rotor is required.
Alcon Pro-System 328x42x64mm 12-Bolt D Bobbin Mounting (DIV4212C) Brembo Replacement Rotor - Left
