Looks to be a bushing. I don't remember anything like it on the trans side. Could be part of the release bearing or remnants of an old clutch brake?
Interesting. Clutch was changed about 10 months ago, due to the bellhousing breaking and jamming the clutch fork. I greased this sucker about 5 weeks ago and didnt notice this. There was some rattling coming at 2000rpm so I thought the bearing might be dry.
I will try to remove the bushing.