Ideas for installing dust light on shell

Hello, I am trying to get a few ideas how/where to run the wiring to install a dust light on my baja rack. Whats the best way to waterproof the hole?

 

Evening bump, thinking about drilling a small hole in the yakima track that my Baja rack mounts to. From there it's pretty easy but have not found anything besides a few grommets and some silicone to water proof the hole from the wires.

 

tube clamp? weld a trick tab?

 

Thanks for the reply, the baja rack already has a tab. Really should have worded my post a little better. Trying to figure out the best way to get the wires to the lights. Figure I can drill a hole in the track system the racks use but trying to find the best way to seal/waterproof the shell after I run the wires through