The combination is correct. The HD Bilsteins go with the stock springs and ride height, but if you go to the shorter sportline or aftermarket springs, you must use Bilstein Sports which are made for the shorter spring height.

The price sounds high to me, since you can get the sway bars at your MB dealer and are not very expensive. The part numbers were in an article in the Star magazine about five years ago. A good counterman at the MB dealer can look up the numbers if he wants to.

I have the sportline sway bars with stock sway bars and like them very much.

If you go to shorter springs, shorter spacers or ANYTHING that alters the ride height, you must find a savvy front end alignment tech to do a proper four wheel alignment.

Good luck,