Mounts to the carb heat shield.  Excellent hand machined and finished part.  Exact copy of OEM in Stainless Steel. Expensive US sourced stainless.
 
Watch out for counterfeit copies being sold out of Northridge, CA - legit versions can be purchased from datsun-roadster-parts.com (Paul Wells) or Sincitydatsuns.com (Brian Zana) 
 
Email about a  combo deal with a new 1600 heatshield for 200.00!