I just wanted to see before I put it on the for sale forum. It's your standard round knob that came from a Mitsubishi Evo 8. It's a titanium knob that weights 204 grams (7.2 oz.) As far as I know Nissan and Mitsu have the same thread pattern, but i'd have to verify that.
Anyway, just thought I would check and see before putting it up for sale. ARC is out of business so it's a rare piece.