I decided that I want to replace my 2003 Volkswagen Passat car stereo with a Pioneer AVH-P3200DVD double-din deck. I have a monsoon system right now and I may need to get a special wiring harness to work with the connections on the back of the new deck. Crutchfield says that I can only use a single-din deck, however the deck in my car right now is exactly the same size as any other double-din deck. So what do I need? Conversion kit? Wiring harness? etc?