unfortunately the 350Z ones (the LSD ones are about the best kits around btw) are flimsy, wobble and are actually a major headache to install.
The Z doors are MASSIVE, and very heavy (and pillarless). All these factors contribute to make the lambo door kits very very wobbly on the Z, when the doors are open. And that's no good. They are much better on toher cars, where doors are smaller, lighter and have pillars, they don't move at all and feel very solid, but on the Z..... not a good choice imo.