@Remington_PRO4X
I think this is gonna be a DIY project. I was able to find lots of different fittings for the Nissan Utili-track™ Channel System on both eBay and Amazon, but nothing that was a ready to go item except the few accessories sold for outrageous asking prices by Nissan. I'm not sure of the dimensions based on your Pic, but those look like they might be modified logistic track or L-Track. (Other pics I found when searching look more like standard L-track.
https://nissanofdenverparts.com/media/images/ecatalog/catalogImages/1011/th_ttn-acc-lg-tiedown-cleat.jpg ) If so you can get all sorts of basic tiedown fixtures off Amazon and other sites. You might pick up a cheap L-Track Mount and see if it works. If the L-Track Fittings Do NOT work then you could remove the proprietary track and replace it with standard L-Track to give you a standard platform to build from. These (
http://www.uscargocontrol.com/Ratchet-Straps-Tie-Downs/L-Track-Stud-Fittings-Accessories/L-Track-Double-Lug-Threaded-Stud-Fitting ) make good anchor points for things like storage boxes and a Jerry can holder. You can get simple locking Jerry can holders from many good surplus shops add one of these on the bottom and side rail and you're set.
Tiedown points there are MANY options to choose from.
Boort