Rear Bar Modular Single ShelfAs of February 2023, Raslarr have introduced our new modular swing away. These were designed with the intention to allow for a variety of configurations to enhance your new or existing rear bar set up. If you already have carriers on your rear bar, unfortunately thiswill not be compatible with the existing carriers. **Base arm is required if modular carrier never purchased** Modular attachments will not work unless you have a base arm. Breakdown