On this parts fiche the Bolt,flange,6x55 is the most specified component.
A sample from the products for the E-6 include: Collar,17mm, Bolt,special,12mm, Oil Seal 14x24x6, Clip,2x70.
twenty-one components are shown in this Cr80r 1999 He04-250 Japan (jdm) E-6 exploded diagram.