Let me change it up:
You have a Corolla LE and need new shocks. You buy shocks that are for the same model and they indicate they are for the LE & S and order it and receive it. You go to install it and find out the mounting holes don't match up and then later find out that it wasn't indicated anywhere that you had to buy a bracket kit to use it on the advertised model, wouldn't you be a bit peeved?
The point is, the B6 comes with gullwing, the B6D comes with flat. That's just how it is. There is no such thing as a B6D gullwing or a B6 flat. The B6D flat fits on a B6 with different tower, the B6 gullwing fits on the B6D with a different tower.
If it looks like a duck, quacks like a duck, and you call it a cow, it doesn't make it a cow. :P