The 20-0263 Fuel Rail Plumbing Kit, LS1, LS2, LS3, LS6, L76, L99 reuses the OEM fuel hose. It is a direct bolt-on for all LS variations, excluding early LS1 engines that use an in-rail fuel pressure regulator. The inlet fittings permit the use of the OEM 3/8" SAE quick connector. A PTFE -8AN crossover hose is used for the front of the rails. Plugs are provided for all unused ports: (LH rear, RH rear port, and RH center).