So just a heads up, I measured the stock dampers now that they are swapped out with my B6's. The fronts are essentially the same (B6 vs stock). The rears... are a bit less straight forward. The shaft is the same length, but when fully compressed (gently), the stocks have about an inch extra travel vs the B6's. Either way, the bump stops should stop them both well before bottoming out but if you plan on lowering the car via springs I would definitely consider the B8's instead.
Note: measurements are with a tape measure so take this more of an estimate than exact science.