Looks like the spring, yes.
But I agree with the comments that an ST is too young to get a spring that bad.
Make sure you change both springs on whichever axle that has come from as the car will be un balanced.
Don't try to save money and have just one done because the other one is obviously as bad as that and will go soon anyway.
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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="" />