Illuminated Rx-8 5 spd shift knob
 

Found this, thought some might be interested. The black one says only 6spd but I have heard from people that ordered it you can get the 5spd one. I would contact them first to make sure but at around $150 shipped it is better than any group buy I have seen or any other site.

They can be found here http://www.partsmazda.co.uk/interior-stylingx8/?page=1

You can give it a try, but I ordered one from them a year or so ago and they canceled my order saying it was a price mistake.