6) Bring the latch into position and install its (3) Torx fasteners. Make sure the kiddie lock tab is in place before final tightning.
Re-assemble the lock/latch joint and hang the trim panel and you are done.
I am sure I left out a minor step or two, but this covers the major stuff. I was able to find a new latch here:
Used Auto Parts | Used Car Parts | Auto Salvage
In the "select a part" field, select "window regulator rear" This will locate those salvage yards that have the door internals instead of a complete door for sale.