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I think they came with your 3+1 set or 4+1 for the "heavy 1/2 ton". The PO of my truck put in 4.1 springs, I have no idea where he got them, and he added home made drop shackles because they jacked the pick up way too high.
I thought that initially also, but after looking closer it appears that the clamp that is clamping the overload leaf actually belongs farther out toward the spring eye. No idea why anyone would have moved it though.