I just went the easy way and ordered the OEM Yakima bars from St. Charles Isuzu. I don't want longer bars and I dont want it hanging out wider than the rails anyway.

Their number and link is under the "Accessories" section on the site here.

The MSRP was (I think) $330 or so and they give a 15% discount, so it's $288 including free shipping.

Yeah, it's probably more expensive than I could have done it for, but hey, what the hell-- I just spent $18,000 for a Vehicross, what's another $100 difference?