There's a thread on this exact problem.
http://www.allfordmustangs.com/forums/2005-2010-v6-mustang-tech/324052-auto-shifter-plastic-cover-replacement-avaiable.html
You might find some help in there..
http://www.allfordmustangs.com/forums/2005-2010-v6-mustang-tech/324052-auto-shifter-plastic-cover-replacement-avaiable.html
You might find some help in there..