Does your factory radio have sat built in as well as the cd changer??
Assuming nothing has changed u will probally use the same adapters
I used in my b6 passat. The PAC c2rvw,which is the main harness that connects to the factory harness it also gives u the dimmer wire the back up wire and the 12v switched wire. You will not have to splice into the factory wiring at all. The swi-can, will covert the can signal that the car puts out when u use your steering wheel buttons.. The swi-ps is pioneer brand specific and will plug into the harness as well as the radio and lets u program the steering wheel buttons to control the radio functions you want.. You may also need a antenna adapter..
You should be able to get everything from www.enfig.com
They are located in the US . I don't know if they have dealers in your area but you could google PAC and see if they have INTL dealers