Bringing this thread back to life.
Brought the 370Z over to Bruce Bennett in Wilton, CT. They know the Z platform well and the previous dealership owner raced a 350Z through SCCA or NASA. If you're somewhat local, they can help you.
The end result is the bits and pieces in the shifter assembly were a bit loose and most importantly the rubber boot piece, which you can see in the picture I posted above, slid down causing the nasty vibration/rattling at high RPM. They insulated the rubber boot, repositioned it over the spacer and zip tied it in place. I can noticeably feel the rubber boot in position and firmly in place with everything reassembled. No replacement parts were necessary and 99% of the noise is gone. The remaining noise is simply NVH from the drivetrain.
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