How To Edit Widescreen to Anamorphic?

Hi, I have some footage shoot at 1280x720 I would like to transform it to Anamorphic to give a more cinematic look. when I create a new sequence of 1280x696 and drop the footage this show with black bars on the sides :S . What is the workflow to do this? I also want to be able to recompose (when is necessary) with the motion tab. Thanks
 
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