The Alcon Pro-System replacement rotor specified as 328 x 1.385 in x 50.5 mm is offered as a left-side rotor produced to the listed dimensions. As a direct-replacement part, it preserves mounting and thickness to ensure proper pad engagement and braking characteristics for applications calling for that 328-size left rotor.
Alcon Pro-System 328 x 1.385in x 50.5mm Rotor - Left