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First time I've heard of dual parabolic? springs. The price is similar to mono leaf springs. Any information on where to purchase these springs? website?
You can go to www.posiesrodsandcustoms.com or just find the last copy of Rod and Custom magazine and look for the ad...next to the last page if I remember correctly. They actually look a little like monos - same idea I guess but you do have a second leaf if one breaks and they should be a little more progressive. They come with bushings installed and have teflon sliders betweed the spring leaves. Posies will also sell the teflon buttons separately according to the gent I talked to - $1.00 ea. Industrial Chassis also sells them if I remember right.
I like the middle ground concept of the dual leaf springs but due to costs (truck habit starting to get costly and noticed) I will probably try to rebuild/drop leaves/teflon button what I've got. I can always pop for "store bought" later if I can't find happiness with what I've got to work with.