STEDI Light bars will come with either side brackets, sliding brackets, or both. Below is a brief run-through on both mounting styles to help you through installation.
Best described using the diagram below, the side brackets should be assembled in order of components: Bracket Arm > Washer > Spring Washer > Bolt.
The bracket will need to be assembled prior to installation. Using the wider opening in the channel of the light bar, insert the bracket and slide to the desired position for mounting. Once the bracket is in position, tighten down the 2 grub screws to secure the position in the channel.