Well if it has a twin pipe rear box?
Trim for exhaust tail pipe 2x76mm - 3C8 071 910 - £94
It also shows Trim for exhaust tail pipe 2x70mm same part number and price.
They aren't cheap but you will find cheaper ones on fleabay if you search.
This is a good site to keep in your favorites/bookmarks? http://www.partsbase.org/vw/