Sprinter adding pwr windows and locks

Has anyone installed aftermarket power windows or door locks on a sprinter? The power windows are straight foreward but the door locks are a nightmare so far. I think I need the OEM sliding and pass rear door jamb contacts. There is no clearance to screw anything into the sliding door and the pass rear door closes flush. The sliding aftermarket contact I have from AAMP is too bulky. The next hurdle is the lock actuators. I can only get the front doors so far to move only one direction using a 5 wire servo. I need to use 5 wire servos in front doors so they will control all the locks when you use the key. I'm getting pricing and availability for OEM servos and door jamb contacts from 2 local Dodge dealers. I gave them digital pics from a loaded Sprinter and they can't identify all the parts I need. Any Ideas or Success stories? Thanks in advance for all your help!

After market central locking is a pain in the ass i don't think i would ever do another set.

Try a mercedes dealership. the van is almost all mercedes anyway. A dumb thought but might work.