I think the lights are usually just clipped into the screen. The vent itself is nothing special as long as you get the clamp-on style. I recommend upgrading to the Heng’s RV LED Chandelier. Much more clean look, and really really bright. Only thing I would change is I wish I went with warm white instead of cool white.
https://www.amazon.com/Hengs-HG-LR-C.../dp/B01EXKTYTU