door locks

Does anyone have any helpful hints on how to install new lock cylinders on a 91 GT? I have them in place but can't really tell the best way to attach the bar that runs from the cylinder to the assembly for the remainder of the lock assembly.

Hey guys I bought a new lock for the trunk on my 89 foxbody but I have no idea how to install it.. when I bought the car it had no lock in the back so I didn’t have to take it apart. I’m confused on the lock extension and where it goes on the lock itself. Any one have an idea how to fix this...