question

The one on the left looks like a screw with a clip, and there's a two way arrow next to it as if it adjusts something, but it doesn't move. It doesn't seem to really do anything except go into a hole (the seven black metal screws hold this plastic plate in place). Then on the right is an open...

Since some of the first mods people do are usually wheels and suspension, I was wondering what wheels people would throw on the new Z when it comes out?