Is this the correct Towbar for me?

[Alec B]

Hi to all, I'm looking at buying this for my newly acquired 2005 C5 estate. I'm just a bit unsure if it's correct as the car they say it has come from is a series 1(so will it fit a S2?) and the pic of said car has a flange type ball. Any help appreciated. He also has a full leather interior as well if anyone interested. Alec.
http://www.ebay.co.uk/itm/170775512900? ... 1423.l2648" onclick="window.open(this.href);return false;

[Lighty]

series 1 and 2 towbars are the same on C5 estate