Bigglezworth have not you looked at your brakes in 6 years?
Since we're talking about a special model of the Phaeton, you should not then take a look through your wheels to see if your discs are similar to those we talking about?
Especially when I made a post about another RS6 owners who said they do not fit,
Didn't you even thought for a second that you might have another Phaeton model on your car before you responded that they fit perfect!?
Look at this picture, there you have an RS6 disc without holes bottom left, does it look like your brake disc if you looked through the rims?
It is most likely an aftermarket brake disc without holes for Rs6 you have.
http://www.yoyopart.com/oem/7369787/vag-4b3615302.html