I found two more usefull websites for parts. I will add these to the sidebar section:
And this one:
Guess what, this shop does have the Carello foglight on stock. This was exactly the item I was after at the time: http://erwin400.blogspot.nl/2013/11/carello-fog-lights-part-ii.html
Meanwhile the Ebay seller found this item. So I had already purchased it from him. As such I now have complete set of spare foglights on stock.