I find that interesting about the module missing. Both our 2010 E350, 2350 and 2011 E450 2552 have remotes as I stated before. Neither unit was ordered special and when we arrived at the factory to pick up the 2350 I asked where the remotes were and they said they do not come with remotes, but if you want to pay for them we will have the Ford rep come over while you are here and program a pair. Which they did while we waited. We had gone back to PC months later to decide what we wanted to do on the 2552 and at that time they already had the Cut-away chassis for our new unit to be, on the lot and at that time we said we wanted the remotes programmed before we came to pick it up. So, neither unit was special ordered to be set up for the remotes.
Seems strange Ford would pick one chassis to leave out the module and not others. Maybe PC could shed some light on why that occurred.
A few years back we had an aftermarket alarm system installed on a Ford pickup truck. As long as the solenoid operating door locks were there, it was easy to install the remote locking/alarm system.
Bob