Fixing boost leak by the injectors

[Andrew7dg]

I have a boost leak by the injectors on my GSX. I took apart the ones on my GS and there seems to be Three seals, one by the head, the other is an O ring on top and there is one below that one. I went to red rooster and on the computer they said I would need two sets of O rings for the GSX. I am confused I know there is one located near the top of the injector but where does the second one go? I thought there was another seal besides the O rign inbetween the injector and the head but red rooster doesn't carry it and they said probably I won't need it. Is this true and I should only replace the O rings? Where is this second O ring located? Third I should probably replace the third one which looks like rides inbetween the fuel rail and the injector but who would carry that?