Any bars 48" and longer fit. A wider fairing would work, though you might want to trim it to fit between the roof garnish.
What type of support towers does this rack have? You need 'Control Towers', which list around $160 for the set of 4. This is the most expensive component of a Yakima setup. Unless it was mounted on an Element, you still need to buy the adapters for the Element (2 x $30).