Rotor Thickness: 29mm. Fits 2001–2010 GMC Sierra 2500 HD with 6.0L or 6.6L V8 engines. Engine Options: 6.0L V8, 6.6L V8. Model: Sierra 2500 HD. Precision-machined for balanced operation and long-lasting durability, the rotor promotes effective heat dissipation to help reduce brake vibration and noise when paired with compatible brake pads.