Tire Rack doesn't list them as existing and I could swear others have them on their car. Had them on my previous A6 and found them to be superior tires in every aspect.

I have the tires you inquire about.
Got them from my local Direct Tire shop. I know the owner. Not sure you are local to Boston, but the folks at Direct Tire in Watertown are great.

PS: love the tires. They are awesome in snow and rain. Much better than the M2's I had previously on another car. But it could be because the M2's are on a RWD!

You should give my buddy at Discount Tires a call...he can get them for you...

the sight by car specific size.

Yes I have this setup. I purchased stock sized 18x 8.5 ET30 Euro RS6 look rims from AAA Rims who had TireRack supply tires, Dunlops Winter M3.
Tires are stock 255 40 18s.

Looks great rides great have no snow experience yet. Ask for Dave at AAA Rims. The set was shipped mounted and balanced to my door. Spent 300 miles on them so far perfect. Hope this helps.

Had to go with the Pirelli 240 Snow Sports.