I recently installed the tow hitch package on my 2017 Model X. The tow hitch bar replaces the rear reinforcement “crash plate” that is mounted directly behind the rear bumper. Therefore I have that part laying around. If your X has been rear ended, it’s likely this plate is a replacement part. It’s about 4 feet long and weights about 15 lbs (total guesses). It’s available for free to the first person that DMs me with details on their pickup date in Fairfax, VA.