I needed the plastic cover for the front seat track for 2011 GT. It was available on several parts sites. It was about 20 bucks. Genuine Ford part. Just kinda surprised that it was easy to find for a 13 year old car.
Used parts are now fairly easy to get for the ‘05-‘09 Mustang at the junk yards around the Boston area if you know where to look but the 2010-2014 are far and few between.