To get the proper springs for a Lightning, you would need the spring code from the door jam of a Lightning. I can only assume that the reason why you want the Lightning springs is the lower your truck slightly. You could buy the Eibach pro truck lowering kit which is on sale for $193 @ truckperformancecenter.com. It will lower your truck 1" in front & 2" in rear which is what the Lightning is lowered. Hope this helps.
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