I got my controls from a shop in Ohio at a real good price. it's a Air Lift, very happy with it. PM me and I'll give you the name of the shop. Can't list it here. My Ply has stock rear springs under it with a Ford 9" and a original M11 in front. I ran air just in the rear of the Buick so I could drop at shows and have a real tail dragger. I drive it at ride highth most of the time.