Replacement parts

A quick learner from Muncie says:
I need to replace both parts of the door I think. I think the one part is 40-191 cause the measurements are the same but how do you know what handle matches?
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Tom from SWISCO responded:

I agree that the 40-191 is a match, yes. This is designed to work with our 40-199 handle set, but you will have to compare our dimensions to your original to confirm.

SWISCO 40-191 Storm Door Multi-Point Mortise Lock by Pella
SWISCO 40-191 Storm Door Multi-Point Mortise Lock by Pella
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How to flip a storm door mortise latch.
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40-191 Mortise Lock Latch Assembly Removal
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