OEM Toyota 2JZGTE VVTI Waterneck.
This neck is off both Toyota Supras and Aristo VVTI engine variants. It has a slight offset compared to non-vvti waternecks. Being that the non-vvti variant is discontinued you can still use this and only people with a good eye would notice the different angle.
Note: This comes in the original packaging and was only removed for photos.