This is a custom hand-made water neck, which eliminates the thermostat.
This is for 6-bolt 1g-style setups. Will not work with 7-bolt water pipe, but you can convert to 6bolt water pipe with this.
For the radiator cap, the options are as follows:
Mishimoto 2.0 Bar: This is a standard radiator cap, nothing special about it.
Meziere Radiator Cap: This one has a billet top, and is locking, so it cannot vibrate off ever. This is a super high quality radiator cap that looks amazing.
These are hand-made to order, and usually take about 2-4 weeks to ship.