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I was confused by this same thing. I called jeggs and they said to use the top ring that goes all the way around. I know it seems like it has further to go in but I was told that being a little loose is normal and if they werent they could sieze up
Clips go on the top. Insert injector into fuel rail and use the retainer clip to hold inplace. Then with all injectors in the rail just place them in the holes on manifold and wiggle and press down. Presto!!!!!
Don't forget fo use oil on the o-rings top and bottom.