harnesses are more suitable to a seven, as they "hold" you in tight, whereas a seatbelt only works with forward inertia. Since the roadster is completely open i would suggest that you invest in a set of harnesses, but its completely down to you. If your just going to be pottering about then seatbelts should be fine, but if your going to be ragging it about then harnesses would be a much better idea, especially for any passenger as theres nothing to hold onto, you dont want to eject someone at sixty miles an hour
