To be sure, you need to check the specifications of the Cobalt SS wheels (bolt pattern, hub bore diameter, and offset) and compare them to the specifications of your Pontiac Vibe's wheels. This information is usually found on the inside of the wheel itself, in your owner's manual, or via online resources that specialize in car specifications. Only if these specifications are identical should you even consider using them. Even then, it's wise to consult a tire professional to ensure compatibility and safety.