By any chance, would it pertain to this Ford TSB?
TSB
12-8-24
GRUNT/CREAK/CHIRP/SQUEAK NOISE FROM THE FRONT LOWER CONTROL ARM OVER BUMPS
Publication Date: August 30, 2012
FORD:
2011-2013 Mustang
The article supersedes TSB 11-10-17 to remove the production fix date, update the model years...