What O-ring for the Fuel Injector is this?

[chico904]

Hey guys, I ordered as Fuel Injector seal kit, and have no clue what the one O-ring is . In the pic, its the one on the bottom left that has grooves on it. Any ideas?
Thanks,
Charlie

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[Dsmkauai]

Not for our cars. Probably for another application that uses the other orings as well.

 

[chico904]

Thanks bro!

 

[autocrossn]

Looks like it might still fit the top and bottom seals though