Are the wires under your passenger seat hooked up? Hard to believe both the buckle and the SIPS bag would go bad. These codes will trip if you disconnect the sensors with the battery still plugged in. Did you do that, or are these random codes that just popped up?
If all of these are truly faulty, you would need to source new ones. Have them cleared at the dealer and see which codes come back... that's the proper way of doing it.