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I think you'd be better off buying the right kit, it would be a major surgery to make the later kit work on the early truck. The offset from the frame is off by over an inch and the drop from the frame is a couple inches more than it should be.
We probably won't do a 2.5" lift for the early truck, the brackets get pretty goofy and the demand is somewhat low. I hate to not build this stuff but some volume is required.