Alright, can anyone tell me if I can get away without the lower most seal/ring on these 99 injectors?

I found the o-ring/seal kit but it doesn't come with the part that's missing from the top injector.

I maybe wrong, but I think that's just for centering the injector in the head and not for sealing purposes.

Any takers?

Mucho thanko,
-Flounder

 

You have to have it.

 

its a pintle cap.

 

Is it available? got a part # by chance? I really hope I don't need to buy the whole injector.