Brand new.  Authentic.  Purchased from blox but never used.  This is the gen 1 version

The Blox Racing 5/16 Inch Intake Manifold Plenum Spacer is specifically designed to fit Nissan 350z & G35 Vq35 engines. It is a custom performance part that is essential for improving air and fuel delivery in these vehicles. The black spacer is durable and manufactured by Blox Racing, a trusted brand known for high-quality car and truck parts. This front placement spacer is a perfect addition for enhancing the performance of your Nissan 350z & G35 Vq35 engine.