I hope you will give us an exact description how to convert from air to regular suspension. I am just about to get it done. The local Lexus dealership did not even want to look at it. I contacted some of the tuner shops here but they have never done it either. So we are flying basically blind. There are some threads on the forum but they are incomplete and assume you have done some of the air work already. There is no info how to remove the rearseats from an Ultra. Presently I am waiting for some parts. The parts from the air will not fit the conversion. You have to get all the components from a regular suspension, topmounts, bellows, bumpstops, washers, etc. before you can mount the springs and shocks.