I got it from dmb graphics, they have them for 2011-2012 for explorer but the fit perfect on the edge the company is in the UK but they have many color ways to choose from now they even have some hot carbon fiber color ways
Ask the FordGuru for TSB cause i had the same issue it wasn't the heat shield it was something else but i can't remember cause it was so long ago but the FORDGURU gave me tsb and i printed it out and took it to the dealership and problem was solved