BX3 Roll bar clamps. This is a pair of non metallic clamps. These clamps feature a 6mm bolt for mounting accessories to a rollcage that utilizes round tubes. We have made a minor modification to the hardware that allows the 6mm bolt to provide a ground for antenna mounting assuming your cage is grounded.
BX3's description: Made of extremely tough nylon and uses corrosion resistant hardware. Won't scratch the paint. Holds over 75 pounds. Use for mounting windshields, roofs, fire extinguishers, mirrors and much more. Sold in pairs.
These are made by BX3 Side by Side Products
Not sure what size you need? Use this chart for roll cage sizes of popular machines.