Yeah the wiring is different, but they will bolt right in. I have 04 Denali seats in my 01 Burban. I had to splice the seat wiring into my factory wiring under the carpet for my orignal seats. Connect the really thick orange wire to hot and the thick black wire to ground. The orange might have a black stripe on it, I can't remember. Hooking up those two wires will have everything except the memory function and the seat heaters working. Those two functions need to communicate with the BCM in order to work. And it needs to be a 03-06 BCM. So unless you completely rewire your truck to have a 03+ BCM and harness, just go ahead and give up on the memory and heater functions. I am perfectly content with mine not having memory or heat.