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Roll cage for the ever popular china 2drJK body, it mounts in the same spots that the factory hard top does when you take it off.
Here's the hardware sizes needed to mount it.
Front(over the windshield):
2.5x6mm(outside where the the factory hardtop mounts) & one 2x6mm button/round head screw & nut in the middle.
2.5x16mm cap head screw & washer
2.5x12mm cap head screw & washer