Inside Door Latch

A quick learner says:
I am in need of an inside storm door latch. The dimensions need to be the same as your 40-145 part number. However, I am looking for a latch that has a lock built in. See pics below of my old door latch. As you can see, there is a built-in lever that operates the lock mechanism.



Do you make an inside door latch with the measurements of your part 40-145 AND has a built-in lock mechanism? If not, can you refer me to another company that does?
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Emily from SWISCO responded:

Hello there!

We appreciate you reaching out to us. This looks like the inside handle for the old Sears handle set. If that's the case, the 40-145 latch should be fine but I'm not sure how compatible this is with your outside handle. I personally like to replace the whole assembly with the 40-177. However, I'm afraid neither of these parts has a built-in lock mechanism on the inside handle. We're not sure who might sell such hardware, unfortunately. I am sorry for the inconvenience. 

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