XL to Lariat

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Hello, I've done massive reading/research on this. Forum searching, googling, etc. Even called asking parts guys, diesel techs. No one really has much of a clue at a dealer if its not direct part replacement.

What I have is a bare bones 03 XL truck. Manual trans, floor 4x4 shifter. What I want is power windows, locks, seats and mirrors.

What I've done so far: 03 King Ranch body harness.. the harness responsible for running all wires to doors and seats. I have 07 lariat seats. I've also got the door locks and new window regulators and motors in the doors. Lariat trim panels with all switches. 2008 tow mirror upgrade w/ heat/power/turn signal.

What I've figured out I'm missing: MORE HARNESSES Vehicle Security Module/Keyless Entry Module

I'm hoping someone thats done this the OEM factory way would have more insight on this beyond 'find a truck and pull crap off' it. Not an option here. I've been looking for SuperDutys in junkyards, auctions, etc since I've had my truck. They just aren't found unless they are work trucks that don't have options in them anyway.

Hopefully someone can chime in on the specific harness I need. Read somewhere I need body and under the hood. Some say body/dash. It's all pretty blurry as to what I need.

Next question would be If I just go get all the harness for the King Ranch truck, would the unused options hurt me that come in the harness? Like the adj pedals, moonroof, esof, climate control, etc. If I can do that then that makes things a whole lot easier. I'll just go buy the King Ranch stuff, and have my VSM/KEM programmed for what I have in the truck.

Appreciate any insight you guys may have on this. Thanks for the read and any input!