Andy,

Merc don't sell vans with central locking and I have never seen one with electric windows either. The central locking and mirrors are available though...

The Sprinters which I have seen with central locking and electric mirrors where fittind by a company in this country liscenced by Merc to retro fit the systems, which are independant to the original Merc loom (which means they can be bought and fitted without much fucking about).

I got my hands on a new Sprinter with central locking last year and ripped the dash switch and control unit out, then butchered the wiring loom to suit a different spec and control unit.