Someone can correct me if I'm wrong ..... but the cargo cover only came stock with the touring package models? Not sure about the Nismo versions either? Mine is 2011 base model with sport package. Didnt come with it, but the hexagonal looking slots, and hooks on the rear door are there to make install super easy. Other than that...they're considered as an add-on accessories part that will fit any car.
I've also read that they can fit a 350z as well. I've seen them retail from $250 - $340 range as new. Probably cheaper if you go to nissan parts direct and avoid a dealer, because the dealer will have a mark-up a charge of course ....... they gotta make some $$$$ off you right?
I also read that if you have an 09 and it didn't come with it, that other parts or modifications are needed to make it fit. Again, no proof of this ....only telling you some things I've read here on this forum.
I missed a few that were for sale on here for about $100 bucks .....