4B0698471A are listed as housing seals for the A8 and it is not clear from the parts diagram if they are piston seals, but the part is also used on VW Toureg and the diagram for that looks like piston seal and dust boot, although no piston is listed as a spare part so is not on the picture.
When you get VAG piston seals, they usually come with a sachet of red marinade that you have to soak them in for a few hours before fitting, so factor in half a day or so all in all.
There are images on google image search and it looks just like a piston seal and concertinad dust boot.
Good luck!