Where can I get one like this?

 

Dustin @ Strafe has them available as a Nismo replica. Look him up.

 

Strafe doesn't sell the Nismo replica rear, just the front.

You can get the replica Nismo rear lip from Ionic.

https://g35driver.com/forums/exterio...ionicflex.html

 

Just FYI (and I don't know why Marcus did not catch this, LOL), but the Authentic Nismo and Ionic replica rear lip only fit 03-04 rear bumpers. If you have an 05, you need to do a rear bumper and mudguard swap to fit the rear lip.
GL!
rob.g