Restore factory performance or complete your LS swap with this LS1 / LS6 Ignition Coil Harness designed for D580 coils in stock bracket locations. This harness is a direct replacement for GM part #12558948, making it the go-to solution for repairing a damaged harness or wiring up your LS engine using OEM-style ignition components. Engineered to work with LS1 and LS6 intake manifolds, this harness maintains factory-correct routing, plug spacing, and coil connector placement. It's perfect for OEM restorations, swap projects, or servicing an aging LS1-based platform where ignition signal loss or coil issues can stem from worn harnesses. Whether you're replacing brittle wiring or building a clean swap setup, this plug-and-play harness eliminates headaches and delivers OEM-style reliability you can count on.