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My brother got a stretched F450 (3 doors on each side) 8 Foot bed, DRW and he went to the salvage yards to get various parts. You might find your harnass that way.
I don't think it can be done as the wiring isn't there if it wasn't on the build order at the factory. Ford even says the factory upfitter switches cannot be added by a dealer later on. You will have to end up going some sort of aftermarket way if you need the aux swtiches, making sure everything is fused and relayed.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
