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Where and how is the upfitter relay box mounted. I was told behind the glove box and that the mounting hole are there "this is in a 04" Anyone have a photo? Also what size screws are they? metric? Thanks
Upfitters were an option in the '05 and up Super Duty trucks - not sure the holes are already there or not in the '04 models. If not, wouldn't be hard to fab something to mount the box to behind the glove compartment. The bolts I used were M8 X 25 if I recall correctly. If you have the kit, you can put it up there and see if you need to drill a couple of holes.
Several guys here have installed the upfitter switches in the '04 and older trucks and I'm sure someone will chime in with what they did for this. You can also do a search on here and find more information.