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@walm
That one looks fine but you would need to buy the miche track sprocket carrier for a fiver too.
This one would just swap: http://www.jejamescycles.co.uk/surly-track-cog-item45408.html
If you aren't going to a LBS to get the sprocket changed you will need a lockring tool to get the lockring off (and back on again). Plus a chainwhip (or you might want to google rotafix).