Hi Snapdragon,
Very good, easy & well worth doing
The web site on your link is a trader on Polish ebay.
I have located two stealers in Germany that have the full kit in stock. One in Gottingen and the second in Osnabruck. I have purchased the kit from the Osnabruck dealer only because I was stationed in the area for nine years.
Here is the link:-
http://www.ebay.co.uk/itm/Add-On-Kit-3-strahl-spritzwasserdusen-Audi-A4-A6-A8-/321472127040?pt=UK_CarsParts_Vehicles_CarParts_SM& hash=item4ad93b6040
In the details translation they have put
Only for left-hand drive
The part numbers are exactly the same as the ones in your report so I think that there is not a difficult problem here. It may be that Audi produced two versions of the kit, one for left hand and one for right hand drive cars.
I'll let you know how it works out.
__________________
Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)