It is the resonator, yes.
It mounts to the N/S front chassis rail just behind the engine ECU mounting point under the battery.
Take the resonator off the bracket then fit the bracket, it'll only go on the correct way so don't worry.
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2011 Focus 3-door Zetec 1.6 TDCi.
Previous <img src="/images/graemlins/stemo.gif" alt="" />s - 2006 Panther Black & 2007 Red. Gone and quite forgotten <img src="/images/graemlins/lol.gif" alt="" />