I performed a search and was not immediately able to discern what the diff between open and closed o design was.
I have the Nismo Titanium knob installed. Nice knob if you tend to shift like you're gripping a joystick.
Check the DIY section for details on removing the stock knob. It's a bit of a PIA due to the loctite that Nissan used on the threads.
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--Brantly--
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