So i found out the back part of the Z seat is leather and I first thought it was vinyl...I think this is an important find if you want to use some of your old leather to replace a panel up front or I plan to make my own true 300zx wallet out of one day... I cut out some of the inner lining so you can see that the back part of the hide is that characteristic suede look here:
I also finished one seat with the help of my friend. Fitment was very tight which is good but me and my friend had a hard time trying to work a few of the wrinkles out. One thing different from oem is how the head rest mounting holes don't go thru the middle cushions on the upper portion of the backrest cushion but go around it.
Z seat progress - 
