I used the OP's images and made some of the brackets to install them. I used a thin aluminum sheet metal scrap. I made them a bit simpler. Each side piece is the same with the exception of the location for the mounting hole that fastens to the bumper. Also I had to bump the light back using a few washers between the brackets and the mounting so placing the hole attaching to the light as far down as possible or making a slot instead of a hole would be advised.
Here are the bracket layouts: