It looks like the ball bearings, spacer cage, and inner bearing part of a constant velocity joint; like any front wheel drive car is likely to have, at the front hubs.
I dont think anyone will sell you what you are showing in the image. They would sell the next higher assembly. In other words, the entire bearing assembly, or a Constant Velocity halfshaft assembly. I dont know anything about Touregs though.
That kind of a CV joint is called a Birfield-Rzeppa joint. However I doubt most parts countermen wont know by that name.