Get the upgraded and replacement hardware you need to repair or assemble the engine in your 2001-2004 Chevy/GMC 6.6L LB7 Duramax. Upgraded fasteners and head studs are engineered to handle the increased power of your engine with performance components. Head Studs and Fasteners are available for high-performance applications with increased power outputs, as well as OE-style replacements that are engineered to maintain the factory function. Find the Flex Plate Bolts, Fuel Injector Hold Down Bolts, Head Studs, Head Bolts, and more from top manufacturers like ARP, Fluidampr, and more at XDP.