The two foot long black pole looking thingy that connects the lower control arm to about a third of the way back under your truck is your spring. It's called a torsion bar and you have two. The type of springs you are looking for are called coil springs and the X doesn't have them...yet.
To find out all about them, how they work and what options you have type the words "torsion bar" into the search field.
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If we do not succeed, then we run the risk of failure. - Vice President James Danforth "Dan" Quayle