They are Firestone ride rite part# 2153. What I was hoping to accomplish was to help raise the rear up some. I believe the leaf springs have sagged some, I was hoping to raise the ride back up to a more stock like height to help with dragging and possibly provide a better (less harsh) ride. My rig does not wander, it rides down the road nice and stable, but it is very harsh on bumps. The air bags did not seem to make it any better or worse, no matter the psi.
http://www.sdtrucksprings.com/firestone-2153-ride-rite-air-bag-kit-1992-2017-ford-e450
