For additional information, see the Installation Instructions in the INSTALLATION TAB to determine if you need this product when adding additional slats to your Slimline II roof rack. **If building a solid platform on your Slimline II and you need these brackets,note that the slats used in conjunction with the bracket will need to be ONE SIZE SMALLER than the slats used in your rack. FOR USE WITH THE SINGLE JERRY CAN HOLDER: The Front Runner Single Jerry Can Holder is designed to be mounted perpendicular ACROSS 2 slats.If you'd like to mount a single jerry can holder PARALLEL to the slats, you will need to use these brackets.