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We placed an O-ring onto each fuel rail fitting. We used a 13/16-inch wrench to install the plug in the rear of the driver-side rail. A 3/4-inch wrench was used to install the crossover fittings in both rails as well as the inlet fitting at the rear of the passenger-side rail. Before installing the fuel injectors, we applied O-ring lube to the upper seals of the supplied fuel injectors and then installed them into each rail so that the electrical connectors were orientated toward the rounded side of the rails.