on my old mk5 golf, i had to remove the rear trim on the tailgate, and the undo the wiper arm from the mechanism from the outside, and then undo the 3 nuts that were hiden behind the trim. you can cover up the hole buy either buying a rubber plug from places such as halfords, or alternatively, search google for glass rear window plug. i know venom motorsport sell one but i am not sure if it would be the correct size. hope this helps....