Not a genuine GX5 gear knob, but a genuine Nissan dogleg knob, which I believe is an oem part for a B210 US model (which was fitted with a 63A gearbox). I had a bunch of them and they were snapped up fairly quickly at $30 a pop:

It was (to my surprise!) more than 8 years ago.

They were all in nissan boxes.
I
might still have one left somewhere or there might be someone out there who bought one in 2006 and either didn't use it or no longer needs it.