Mortise latch insert for Larson storm door

A quick learner from New Vienna, OH says:
The spring loaded latch insert is broken. Sending picture. Larson storm door model number 23307032.11160824. The latch insert is ink stamped C790. Can I buy this part separately?
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Bob from SWISCO responded:

This looks like a mortise latch similar to what is used in our 40-168. Unfortunately this latch is not sold separately from the handle set. I apologize for any inconvenience. 

A quick learner from New Vienna, OH says:
Can I purchase a new latch set for this door? How much? What info do you need?
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Bob from SWISCO responded:

The best thing to do would be to send us pictures of your existing handle set. But see if it matches something like our 40-168 or 40-188. Let me know what you find.

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