Since drilling isn't always an option, I designed this mounting bracket for LED marker lights on truck running boards. It is designed to fit Nilight 3.8-inch marker lights and attaches to the seam underneath the running board using automotive-grade double-sided tape (I used 3M VHB). While it was designed for truck running boards, it can also be used anywhere that has a similar lip or seam for mounting.

I printed mine in TPU with 100% infill for flexibility and durability, but ABS or ASA should also work well if you prefer a more rigid bracket.

No drilling is required, making this a great option if you want to add running board marker lights without permanently modifying your truck.

If you print one, I'd love to see how you use it!