What are these parts for?

[KyoshoK]

hi. I just built my car but found that there are a few parts i never used...

just wondering what they are for? it dont seem to mention how to use them in the manual as i was building it.


- Some black rubber o-rings (similar size to the white ones for the shock seal, but are black)



- The part that lookst like an Omega sign (right side of parts tree)




- Foam Ball end sheet





- The large circular plastic peice, i thought it was to put it between the threaded shock adjuster and spring, but it doesnt fit over the threaded part of the shock.