buy the genuine 'cubby hole thing' from vw - will fit properly and colour match the black plastic 
Dont get that off eBay...get the cubby blank as its a nice little shelf that can also hold an iPod controller unit or you mobile etc and its OEM and also only around £10 from a dealer!!! My missus had here polo broken into and the 6 Disc changer and Headunit 1/2 inched by the thieving gippo's, so we replaced it with a headunit and cubby...my MK4 is running the same with the iPod controller unit sat inside along with space for my phone...and its felt so the phone doesn't get wrecked. Its OEM so looks spot on rather than cheap black plastic
