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I thing it might be a bit more complicated than just changing the rear facia. This is from Automobile Magazine's "First Drive" report on the 2013 'stang.
"Out back, the Mustang's popular three-block taillights now use LED center blocks surrounded by an LED ring. The outer rings serve as the taillights, while the inner blocks are used for the brake lights or sequential turn signals. The middle LED block switches to white when reverse is engaged, acting as a "hidden" backup light. Mustang chief engineer Dave Pericak says the new LED array is costlier to produce than the former incandescent setup (it uses 12 unique circuit boards), but was deemed necessary "to show that this is not the Mustang of yesterday."
Damn and my first thought was the tail lights remind me of a camaro they just dont look that good my thought is the 2012 Boss they got right the 2013 I am not to sure I dont care for the front end either the hood looks good I bet they saved money when building them from the 2012