AMS amuse body kits
 

anyone know how is fitment on those?

I didnt read any of these but this might give you a start.
http://www.the370z.com/nissan-370z-g...-vs-amuse.html
http://www.the370z.com/exterior-inte...use-style.html
http://www.the370z.com/exterior-inte...l-journal.html
http://www.the370z.com/exterior-inte...ality-kit.html
http://www.the370z.com/nissan-370z-g...t-advises.html

For a moment I thought cooltoy responded :)

As for replica fitment - I hear ShineAutoProject was really good. Fly1 too!

The AMS from Fly1 fits great. Just make sure you get it installed at a reputable bodyshop otherwise you will be posting complainin after the install on how it doesn't fit right.

My fly1 kit I just tried to have put on the car didn't fit. The shop I took it to said the skirts were too short and where the back bumper fit into the back quarter panel was too thick and would take a decent amount of work. To be fair, I didn't bother trying to contact the company because I had been sitting on the parts for about a year (a little longer actually) before I got the money to have them mounted.

That's odd. Fly1 is usually good. I would contact them anyway.