LUPO27

Hi all, This is my first post on club lupo so I dont know if this is in the correct section or not. Anyway, I am currently looking at buying my first car. I have found a VW lupo 1.4 S Auto that I like but I am aware that they only have a cassette player in them. I really want to keep the shelf under the cassette player for CD's and various other things. I was wondering can you buy the VWZ4Z3 unit in the UK and can it be fitted to replace the stock cassette player? Also do the dimensions of the two players match? I really do not want to have a modern looking CD player so am only interested in what VW CD players I can fit to replace the original cassette player. Thanks for any and all replies in advance