Looks close, but also looks a lot taller... The one in the pic looks like it's on an Astra or Vectra... Is it a Vauxhall part I wonder? It also looks like it overhangs the edge of the boot, although hard to tell from a small pic... So probably not a Vauxhall part.
Now, where's the link in that spoilers thread to the website with hundreds of spoilers....
http://www.spoilersmax.co.uk/car_spoilers.htm
There ya go, that should have something for everyone.