I don't know, but it may not be that hard to do.
I know that on some VAGs, like some badged as Audis, it's a real PITA, but this installation may not be too bad.
Visit some VW boards, since they'll be able to give you the skinny.
Your best bet would be to get the dealer to do it as part of the purchase price or to find a good indie and use the cost of this needed task on this 13 yo car as a bargaining chip.
Whether you do it yourself or have it done, this is a real cost for a vital service and the selling price of the car, which isn't in the same range as an equivalent Honda or Toyota to begin with, should reflect this.