Noted this after my previous post. Curious about what you're carrying so you need more than OME heavies. I recently removed airbags (that I used with a medium setup) that I used for towing a trailer. The airbags, at least in the '60, were more trouble than they were worth because they decreased suspension travel (particularly compression) in a setup that doesn't start with very much to start with. I realized that my trailer really doesn't cause enough suspension sag with the OME mediums to warrant the trouble. If I need more carrying capacity, I would think about going with the new OME dual stage springs.OME heavy suspension (rear air bags coming soon)