Trunk Umbrella Holder

Work-in-progress umbrella holder for the C300 trunk, source-backed for model year 2015 onward and attached through existing factory holes with 1/4-20 by 1-inch bolts. Source images show both the physical brackets and their installed position. Use only for a light umbrella, preserve access to adjacent equipment, verify fastener engagement and trunk-lid clearance, and never use the printed brackets for cargo restraint or any safety-critical load.