Good grief, RCA and DIN cables on a micro camera! Why would they do that unless they thought you were going to wedge an old CRT TV into the corner of the windshield?
For not much more than that you can find a wireless camera combined with screen. I got mine at Costco for right around $100. Bolted it to the license plate surround on the passenger side back door. Wired the camera to the reverse light circuit, wired the screen up under the dash and mounted it above the mirror.
The only issue with having the camera offset is that it doesn't quite line up the guide lines on the screen with the van but since you have a good view down the drivers side it doesn't matter that much.
Anyway, that one won't fit your E350, it sez it's designed for some other model:
"This color CCD camera is designed specifically for the Ford Economize vehicle"