I don't know if there is a cheap route. You probably should swap out the axles to the 05+. That way you have something to attach the links too and you could buy a 4-link kit. Or you build some serious brackets to mount your links too.
I was looking at the 08 the other day with lifts on them and it just looks like all the components just bolt either onto the frame or bolt onto the axle so I figured it wouldn't be too hard. Some one had to have done this before.
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