I don't have the pdf, but if I can find my service manual real quick I'll see if I can help you out. Let me go look. I'll post again in a few minutes.
I'm with you man. I've had the bike torn down to it's guts about three times and never seen that. It looks like a bump stop thingy for a car hood or something. I dunno how it would have come from the rear wheel of a CBR.WFT? Is that?
I have the bike apart right now and cannot find that anywhere.