I got a MSA aero kit and want to move the side marker lights under the new fiberglass. I saw a car with this done but forget the site where i saw it. Has anyone done this and if so, can you post a pic???

 

Can you clarify what you mean by "under"?

 

the lights were installed behind the fiberglass with angled slots cut to let the light shine through. I am going to try something similar to that, but instead of slots im making an elongated "z" in the fiberglass and mounting LED truck marker lights to the inside

 

That sounds like it would be very cool when finished. But it also sounds like you'll be breaking new ground, too.