I designed this for my RC 1/14 truck.
I brought a alloy one from eBay with holes drilled for lights. I annoyed me that there was nothing around the sides so measured the same thing and designed and printed. Works and looks great.
It has 3mm holes to attach to the truck.
Please note: This is not 100% perfect as i have not had to much experience designing.
This will require sanding and may need holes drilling out a small amount.
I ended up drilling multiple holes down the bottom (Hard to see in photo) and put light in.
Enjoy :)