A 5-point harness keeps you in the seat when the Jeep is pitched over on the rocks, and a cage only protects you while you stay inside it. The harness needs a solid bar to anchor to.
This Rock Hard 4x4 Rear Seat Harness Bar gives the belts that anchor. It is used with the RH-1005-A rear sport cage. It ships unpainted, so test fit it, coat it and bolt it in.
MPN RH-1005-D
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