handle/lock on sliding door

A quick learner says:
I am trying to replace an old handle/lock on a sliding glass door on a Park Model mobile home. The screw distance is about 3 7/8" apart. The mortise is completely missing. We do need a keyed on the outside model.
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Casey from SWISCO responded:

Hello,

We can't be sure since your latch is missing but it looks like you might have something like the 82-003 handle set with 3-15/16" mounting holes. This assembly does not come with a key lock but can be used with the 82-310 that is sold separately. Take a look and see what you think. 

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