There is 4 bushings on each rear knuckle. Traction arm, camber arm, mid link and lower shock. You have to remove the knuckle to replace the bushings. The mid link, traction and camber arms have no bushings on the side that mounts to the knuckle. They mount to the bushings in the knuckle.
Upgraded Rear Knuckle Bushings for 370Z and G37 | SPL Parts
There is no strut plate.
Chances are that you will have to drop the sub-frame to get to the rear upper arms. I haven't replaced those yet. That's an after Christmas project.