Ford Car Accessories Uk

Is this the correct cable to connect a new alpine head unit to a 2000 Ford Focus?
I recently bought an Alpine Head unit and was going to try installing it myself, but have become confused as to which cables I need. I think I probably need this one ( http://www.lowcostcaraudio.co.uk/shop/Autoleads-PC2-08-4-PC2084-Ford-ISO-Lead_pageJJ1ZZproductJJ157ZZcategoryJJ/ACCESSORIES/FORD/ ) but I am not 100%.
The reason being is that the cables in the car have three adaptors and this only has two that seem to correspond.
Can anyone help?
Thanks.
Sorry I can’t really answer your question but I can suggest a forum with users who will… http://www.ffoc.co.uk (Ford Focus Owners Club)
Another good UK Ford Focus forum is http://www.focusowners.com
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