04 Beetle CD player/disc changer
 

Hi all, just picked up my first VW last night. Got an 04 Beetle GLS Convertible, and had a question. The head unit includes AM/FM/Cassette. However these is also a giant hole in my center console with some wiring in the bottom. I'm assuming this is for either a CD player or 6 disc changer. Can someone point me in the right direction for what I'm looking for to drop down in here? Also, I'm not opposed to the trunk option of a 6 disc changer, right now would just like to have some CDs.

Thanks for your help.