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The Alcon Pro‑System rotor listed as 12.19in x 40mm 54A is the right‑side replacement unit supplied to match that dimensional specification. As a direct replacement it restores correct rotor diameter, thickness and mounting on the right side for braking systems that call for the 12.19in x 40mm 54A rotor configuration.
Alcon Pro-System 12.19in x 40mm 54A Rotor - Right
