The correct installation kit will depend on the make model and year of the vehicle the light is being mounted on.
We can look up the correct parts if we are given the make model and year of the vehicle or you can search for it yourself using our application search.
Applications information can be found on our searches tab or at the link below:
http://search.unityusa.com/application.php
Here are additional instructions:
http://www.unityusa.com/Spotlight-Vehicle-Application-Search_b_7.html