how to remove CONCEALED DOOR LATCH

A quick learner says:
Hello, I have a concealed door knob and latch that has a piece of the door latch broken (see images). I don't think there is another door latch i can use to replace current?? So i think i am stuck with #10-401 replacement kit.

Please advise. ALSO, if i am stuck with kit# 10-401, how do i get the existing door latch out?
Concealed door latch
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Dave Sr. from SWISCO responded:
In some cases, bathroom stall doors are welded together and cannot be taken apart. If you can take your door apart to access the internal latch, you might be able to use the 10-563. If not, you will have to try and take your existing latch apart in pieces to remove it. It will not be an easy process, so you may want the help of a professional.
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