Replace and upgrade the hardware that holds your engine together with Head Studs & Fasteners for your 2006-2007 Chevy/GMC 6.6L LLY/LBZ Duramax. Head Studs and Fasteners are available as OE-style replacements that maintain the factory function of the OEM component. You can also purchase performance head studs and fasteners that are engineered for high-performance applications with high power outputs. Upgraded fasteners and head studs are engineered to handle the increased power of your engine with performance components. At XDP, you can find high-quality manufacturers like ARP, Fluidampr, and more who produce head studs, head bolts, flex plate bolts, fuel injector hold down bolts, and more.