I ended up using the 4th gen connectors on the 5th gen seats.
Here's the really tricky part (and I haven't finished it yet - found a new toy to distract me). The 4th gen seats...had the HSM below the drivers seat. The 5th gen seats, had the HSM below the passenger seat. So I took the 5th gen PASSENGER seat harness off, moved it to the DRIVERS seat, and moved the drivers seat harness to the passenger seat. That way...the 5th gen seats 'mimicked' the 4th gen setup (with the HSM on the DRIVERS side). When you do this, the seat fore/aft power motor connectors needs repinned to reverse the polarity, the others are fine. If you don't do this, nothing bad happens, just 'front' means the seat moves 'back' and vice versa.
PS: DT is the model designation for the 5th gen.
Attached is a pdf of the excel file (it is a work in progress). PM me your email andress and I will send the excel file. The airbags in the 5th gen connect just fine to the 4th gen computer, you just have to repin the connector. I have full functionality of the 5th gen seats, and have stalled with the passenger side heat (drivers is hooked up, passenger didn't pay for the truck anyhow), and ventilation on both sides. Like I said, new distraction...
