Hatch lock linkage diagram needed

Hatch stopped locking despite actuator moving when pressing button. Key never worked because the hatch was replaced before I bought the car and they did not bother to swap locks or get the key. Interior panel is off. Found linkage from key not connected to key, but hanging and connected on the other end. Snapped that back in place.
Found a linkage arm on the actuator not connected to anything on the other end and not sure where it goes but sure that must have something to do with lock and unlock.
I cannot find, because I cannot see where the other end of that linkage goes. I also want to be sure nothing else is missing. I think I will buy a rear lock with key and install it too.