Not an easy task. For four point harness you would need four points of attachment(2 ends for shoulder belt, 2 points for lap belt). 3 point harness would be three points of attachment. The lap belt may be able to use the factory attachment points on the seat but the shoulder belt attachment was probably not designed into the chassis. That is why I mentioned the rear cross bar. The shoulder belts need to be kept within a certain angle or else they may compress your torso in a collision. I have also heard that racing harnesses are actually more dangerous in a street car due to securing the body too tightly therefore not allowing the body to move in a side collision for example. Not much of a concern for me though.
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