For your safety, wrap your brain around this.
If you wear a normal seatbelt, and you flip your car, as the roof collapses it pushes you down in your seat. With harnesses, if you roll it, unless you have a roll bar, the roof collapsing tries to push you down in your seat, but instead just snaps your spine at the base of your skull. So if you wear harnesses, get a roll bar first. Then you can have a harness bar installed on it anyway.
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