My 95 has a wide and narrow end on the injector. It is a return type system. Just be careful of the tips, especially if the tip guard sticks inside the fuel rail pocket. I set the new seals in a little pool of motor oil and slip them on when the old ones are removed. The new seals will make them a little harder to pop in but they will be tight. As for the leaky one, I haven't found anything on locating which one. You can't fire them out of the engine unless there is some kind of test jig for them at Ford. Unless you can remove the LIM, bolt the injector assembly up to it and pressurize the system? That's my best guess. Then look for the one that piddles.
