The part that you mention is hidden inside a box that is mounted behind the center of the dash, the said box, is directly mounted to the Bulkhead/Fire wall, and is pretty much the first thing that is put into the shell on the production line... the 2 pipes that protrude in the pic, in the ebay listing, are the pipes that the rubber heater pipes connect to under the bonnet/hood
Any chance that you can post up some pics of your car, would be interesting to see a US model..
Thom