I think (if I remember correctly) I called Bilstein direct and they did not make shocks for f550. I decided to go with King Shocks due to a family members recommendation (had them made for his Country Coach). I must say the shocks are amazing and feel they made the biggest difference in the ride...might not have done the airbags so soon knowing what I know now. Not trying to discourage you on the airbags, just feel like the shocks made the biggest difference in overall ride. Hope the driveline issue gets resolved soon.
