need new step pipe
2 Answers
if you google "Ford Expedition accessories" you will get almost a 100 000 sites. You might need to get rid of the stock step bars and get a nice set of aftermarket ones, they will also be cheaper than buying factory replacement ones
you can also try e-bay, local wreckers, or car-part.com or LMC truck (http://www.lmctruck.com/)