I purchased the two items that you recommended, although for the handle, I checked the one for the lock included.
When it arrived, the only way that I could get the mortise lock to actually work (have the latched come out) was to press really hard on that middle button when I turned the lever.
Also, do I have to saw off a portion of the actual outside lock mechanism for the inside lever to actually fit onto it?
The directions that were sent are for the wrong handle so I am really guessing here.
Never try to saw off the tail of the key cylinder. They are hardened metal. Cutting them is very difficult. They break very easily when bent. Use two vice grips or pliers gripped close together at the point you want to break. They break easier at the score marks, but will break where needed with a little extra effort.