Other than Chryslers, there are several other reasonably current year model vehicles that still use air pressure to level the vehicle as it's loaded. Lots of aftermarket air bag suspension items on the market too, for many of the "reduced ride height" vehicles, not to mention the OEM items under many late model American luxury vehicles with rear wheel drive. I would think that compressors, sensors, and some plumbing could be salvaged-yarded, or possibly from reman sources.