Missing dust cover?

This is my SR's rear wheel after have been dismantled, cleaned, greased and reassembled.

[Blockierte Grafik: http://img159.imageshack.us/img159/7562/0000441iw2.th.jpg]

Shouldn't there be a dust cover over the external circlip? When I dismantled the wheel, the cover wasn't there; in Haynes manual there's written there should one, but on Kedo's catalog it seems that that part was installed only on XT500. Am I wrong?

Thanks for answering!
So I could reassemble the wheel as it is, and if I'll find a dust cover I'll install it (it can only do good...).

And... what about O-rings? When I dismantled I took out the circlip, took off the lower round retainer (the one that holds the two semicircular retainers) and the two semicircular retainers. Then I took out the crown wheel and the six rubber buffers. But I didn't find any O-ring, while Haynes says that there should be something like 3 O-rings (!).

Should there really be 3 O-rings? Or perhaps Haynes has done another "generalization" between models?

Perfect! Thanks for answers!