I just wanted to share with all that I finally decided that if you want to get the rear diffuser, you've gotta go with the Fujimura vs. the Evo-R. I didn't want to have to worry about fitment issues, and I've been in the forum long enough to know the large majority of Evo-R diffusers, covers, etc. have fitment issues. So I found my CF Fujimura diffuser at
FUJIMURA AUTO Rocket Dancer Aero - Rear Under Diffuser Carbon Fairlady Z Z34 - RHDJapan for $350. I know this is more than the Evo-R, but worth every penny when I dry fit it on my Z. It fit immaculately. The best part was that from the day I ordered it, to the day I received it was only 12 days. Not bad. All in all, I paid $438 and had it on the car in two weeks with a perfect fit. Decide for yourself, but that's my two cents.