Parts such as the F-6: Bush,guide, O Ring,15.5x1.5, O-ring,2.8x1.9 (s, Pipe Comp,r Slide are included in the Cr80rb 2002 (2) He04-280 Japan (jdm) F-6 parts fiche.
In this schematic the "Bolt,protector" is used most often.
The component with the lowest price in the F-6 schematic is the O-ring,2.8x1.9 (s.