Hi Mate,
I had this same problem. The two parts are supposed to be fixed together at the factory and are not designed to come apart. I was just lucky (I guess) that a car alarm installer damaged the finish on my lower consile, so I got a replacement one for free! I don't think they cost very much though - not more than £40 from VW, I think.
Wigster.

I am the Star in the Reasonably Priced Car!!!