Injectors

i bought injectors recently and when i got the on of them was missing the black plastic piece at the bottom. its on the far right side of my rail and was told this is common. can some please tell me for sure. and if it is a problem can someone with spare 450cc injectors PM me i will pay for them.

i bought injectors recently and when i got the on of them was missing the black plastic piece at the bottom. its on the far right side of my rail and was told this is common. can some please tell me for sure. and if it is a problem can someone with spare 450cc injectors PM me i will pay for them.
I've got some 450cc's layng around. The black piece is the seal you should replace them if you're replacing the injectors. pm me if your still interested.

the black piece im missing is on the injector and i think i is what controls the direction of the fuel.

are these my old injectors? If so, they are in 100% working condition.....