I did not have the luxury of time to finish this, but if I were to take it apart, here is the kit needed:
Motor Man - I4 Fuel Injector Service Kit 028471 2.0L Dodge Plymouth
The issue is, taking out the fuel injectors off the rail, the retainer for the orings will be very brittle. I wonder if the pros who do this everyday just unbolt the rail and leave the injectors in place on the manifold. You take the injector/rail assembly out, and so much as touch the tip of the injector, and they fall apart.
The danger is when removing the injectors a couple years later, the oring will stay in place (stuck in manifold) or worse, fall down in the port. Not a big deal if you realize it, and remove it. And, it's only an oring, the engine could prolly happily munch it anyway.