If you have a Volkswagen dealer near you you could see if he has, or could get, part# 6XO 857 058. That's the number on the pocket in my VW Polo (IIRC someone else checked for it in the US, and his dealer couldn't find a part with that number, so it is possible that it's not available in the US) which fits perfectly inside the MkII bay once you cut away all extranous fins, ribs etc on the outside of it (nothing that affects the external look once inserted).

/Michael