2004 E350 superduty trailer lights wiring?

[AzSD]

I got the van for work(cargo) and would like to tow a trailer, I got the reciever and got it bolted up but lost my spare tire storage:/ Now I cant find a wiring kit for the van except from my ford dealer to the tune of $150 for 2 feet of wire and a 7 and 4 pin connector? Seems awefully steep, I think I found the end on the drivers side frame rail slightly behind the spare tire that looks to be where to plug the trailer lights in, is that correct? anyone know where I can get a lain adapter to fit the plug? All I really need is a 4 way flat connector to tow a small flatbed trailer, Ford has that option to for the low low price of $100 Uhaul says all they can do is splice my wiring and give me a 4 way flat for $50, if I wanted to do that I could do it myself though, im trying to get a nice clean setup on my brand new van, any help is greatly appreciated! I wouldnt mind getting a swing away spare rack for the back too if anyone knows where I can get one?

[cocot]

The flat 4 pin should allready be there at the rear bumper. This should be standard. At least it was on my '03. If not I'm sure you could get the harness from a junkyard.

[AzSD]

thanks for the idea about the junkyard. the 4 pin isnt there I guess because theres no way to tow anything with the stock bumper, its pretty much a fleet vehicle work van setup.

[WastegateChad]

Checked Ebay yet?

[equium]

azsd, go here:
http://www.trailerwiring.com/
put in your vehicle type and then find a parts store that has it. they don't have a selection for 2004 vehicles, but i doubt the part will be different. the part number is :
40655. i used this brand on my F250 and it works great.
good luck