32V Duramax Rocker Bridges Fleece PerformanceFleece Performance billet rocker arm bridges for the GM Duramax. These bridges offer a massive 2. 5 time strength improvement over factory bridges. Machined from billet 8620 steel, the bridges are surface ground for flatness, feature improved oiling to the valve stems, and case hardened and carburized for strength. Includes 16 bridges. Vehicle Fitments Chevrolet Silverado 2500 HD 2001 to 2016 Chevrolet Silverado 3500 2001 to 2006 GMC Sierra 3500 2001