In order to fit the new BDS four-link frame mounting brackets, the factory radius arm frame mounts have to be removed. This is the most challenging part of the install because each factory mounting bracket is fastened to the frame with seven rivets. These rivets must be ground, drilled, or chiseled completely out and they're very stubborn. BDS says not to use a torch because the factory undercoating is highly flammable. Further, fuel lines travel inside the driver-side framerail. Here you can see the driver-side framerail with the factory mount removed.