RX8 Clutch Replacement Problem

Hi this is my first post here, I hope I'm in the right thread.

I have a 2005 5 Speed JDM RX8 and I accidentally bought a 6 speed clutch for it (clutch plate and pressure plate).

Is it possible to buy a 6 speed flywheel and fit it into the 5 speed box?

This is the one that I want to buy:
http://ift.tt/2brDoWa

I can get a new 5 speed clutch but that would cost a lot more than just buying a 6 speed flywheel.

Thanks!

RX8 Clutch Replacement Problem