You cannot get the "actual" Rack (Uprights & cross bars) from Yakima you have to get them from Isuzu. (At least no one to my knowledge has found them elsewhere)
Here's a re-print of a post that I made helping another looking for racks and parts.
>>> The Load Warrior is a Cargo Basket that attaches to the OEM roof rack from Isuzu.. You MUST have the OEM roof rack from Isuzu to attach the Load Warrior.. There have been some folk that have come up with roof racks by assembling pieces from Yakima.. I'm not going there.
You don't NEED any "Extension" for the LW but, it is available as an option as well as a whole bunch of other items like Light Mount Brackets, Spare Tire Mount, Hi-Lift Jack brackets, Axe Mounting Bracket, Stretch Nets, and even Zippered, Velcroed, enclosed soft packs. These are all optional addons for the LW system along with the assortment of bike attaching items.
Here's some visual aids to help you in your quest..
OEM Roof Rack
OEM "Wing Bar" close up
Load Warrior Cargo Basket
Load Warrior Extension (It goes in between the 2 halves of the LW to extend the length)
The link I gave you (bikeusa.com) is just the best place that I've found for prices on Yak equipment.
I'd give you specific links to the Yak site but tit is done totally in Flash so, you have to navagate through your self.. <<<<
The rack number is 2-90116-900-0 here is a
link to the rack manual showin all the parts and numbers.
I hope the visuals help some.