I found this old topic, and need to add to it.
On a NC, I saw someone installed a Sparco seat. I have a new 2010 NC, and have a set of quite new Corbeau Fit pro seats (used in the recently sold NA), with corbeau supplied slider setup. I know the sliders/rails won't work in the NC, but what about the seats? Anyone have aftermarket seats, and if so, how is the clearance (head room) for a helmet. I know the twin OEM hoops are too low, but I might be going after a real roll bar, but don't know if those seats will even fit. Any knowledge here.