I do know that the stock cross-bars for the late 90s Chevy Blazer and GMC Jimmy will fit the Vibe roof rails (with some shortening of the screws) and both models have a 'loop' on each end of the bar. I thought that was pretty handy and will be looking for those at the junkyard instead of Vibe bars...
Pandora the 2006 Pontiac Salsa Vibe, 17"wheelsMods: tint, "Pandora" windshield decal, front badge skull overlay, rainguards, hoodguard, Projectorz headlite covers, black painted grills, FIAMM dual-tone horns, black grafxwerks overlays, redouts, Genvibe decals, splashguards, scangaugeII, 12v console outlet, DRL interrupt and I turned off that @#$% seat-belt beep! upcoming: red interior LEDs