Our Polaris Pro R Cage bung sets are perfect to fabricate a custom roll cage. These bungs are designed to fit directly in the stock frame. We have designed our “A” Pillar mount with a wire hole. The “B” Pillar mount on the 4 seater uses our standard RZR cage bung. The back two pillar bungs sets are CNC machined with the same angle as the stock cage bungs from the factory. We thread the back bungs with a 1/2-13 thread and supply a grade 8 bolt and washer. These are big heavy duty cage bungs!!!