The OTTO Engineering NoizeBarrier® RAC Link Conversion Kit is designed for users who already possess the OTTO Helmet Mount Kit. This conversion kit allows for a switch to the AXL Advanced RAC Link System using existing OTTO Helmet Mount arms. It includes essential components to ensure a seamless transition, enhancing the functionality of your setup. Note: The full kit, minus the T-Posts, is included with the purchase of the NoizeBarrier® Helmet Mount Kit and is intended as a replacement or direct conversion for existing users.