They come as standard on the Zetec-S & ST which I have.
Check with your insurance company before making any modifications because if they don't like it they may cancel your policy.
In my 2010 Fiesta there were switches inside the headlight (in front of the bulb) to adjust the beam pattern for driving on the other side of the road. I haven't checked whether the 2012-2015 model has them or not.