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ill tell you with authority, if you do not replace that teflon seal, you are playing with fire BIG TIME.
the steel ring is really a little "shock", as the injector actually moves a very small amount, its there to take up the "cushion" from the spring plate above it.
seriously, REPLACE THE SEAL or you risk blow torching a hole in the head. I have 3-4 cars that came to me with this issue.
@vasillalov, you are completely wrong with stating that #9 doesnt to anything. its WHAT seals the injector. #10 as i said, acts as a cushion.