This was info Darren posted for me in another thread should give you the low down and tells you the version to buy:
"Rich Ill give you the low down on the convenience module,
Basically the early golfs upto February 2006 had a controller in each door both front and rear and they controlled all the functions on the door they are in so with that the convenience module had to be a 4 door controller with 2 plugs 1 for front doors and 1 for the rear door....
Now on later cars after march 2006 the golf runs what's called Lin Bus which is like Can bus but only runs single wire information, this wire runs from each front door to both the rear door so front drivers run the rear drivers and the front passenger runs the rear passenger door.
So although the BT unit is specified for a 2 and a 4 door your car needs to be built after march 2006 if it is then it runs Lin Bus and your fine to use the BT version if not then either a CB or AR module will be needed."
1K0 959 433 CB or AR that would be right for your car, if you find two let me know as I need one myself