Thats the outer bushing on the rear drivers side lateral arm. This came out of my '92 Legacy Turbo. The previous owner told me about how he took it camping. After I bought it I replaced the clutch and noticed about 200lbs of mud caked to the entire underside.
This is the inner race that used to be attatched to the bushing:
I guess it had made contact for so long that it started to wear away at the race itself.
I would like to thank mTK for selling me some 2.5RS Rear lateral arms. And I forgot who sent me the WRX endlinks, but thank's to you as well.
Now the only thing left is to get it re-alligned.
-Brian
