Where can I get a door actuator?

I have a Mercury Villager 2002. I need to replace a door actuator but unfortunately Ford does not make the part any more. I do not know how to work on cars and to find things at junk yards. How can I go about getting the part? My mechanic says he can't find the part…

Need the correct description of part. Door handle, locking assembly, strut to hold rear hatch up? Once you figure THAT out, try e-bay motors/parts & accessories.

The Mercury Villager was a joint venture between Ford and Nissan based on the Nissan Quest. You could try to see if the same part from the Quest would fit.