When we bought our Challenger this past fall, the owner said he had recently installed new air shocks. We replaced the leaf springs and installed regular shocks, so these air shocks are just sitting in my garage. I have no idea how much use these shocks saw, but they seem to be in good condition.
The air shocks are free to whoever wants them, you pay shipping though. I'm located in Yorktown VA.
I'll take a pic if anyone wants to see them.