Schroth Racing Harnesses makes a set of belts that uses the front seat belt bolts and the rear seat belt bolts to form a 4-point harness. They come together like a normal seat belt, so no hassles getting it together or teaching your passenger how to use it.
I installed this harness for the driver seat only, and my passengers complain all the time about how they want one :)
Maybe next year!
Schroth Racing Harnesses
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