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The Alcon Pro‑System rotor listed as 12.19in x 40mm 54A is the left‑side replacement unit offered to match that dimensional specification. Provided as a direct replacement rotor, it restores the specified diameter and thickness on the left side for braking systems that require the 12.19in x 40mm 54A configuration.
Alcon Pro-System 12.19in x 40mm 54A Rotor - Left
