mortise with pentagon hub

A quick learner from Petersburg, WV says:
September 23, 2021
Trying to find a mortise for my Larson storm door. I ordered a new quickfit latch set that was supposed to fit with no issue and it would have, however, the original mortise has a square hub, the new latch is set up for a pentagon (5 sides). I am having trouble finding a replacement to work for one or the other. I want a new black latch to match all my other accessories, but can't find one with a square piece. Also can't find a new mortise with a 5 sided hub to match the new latch, any help would be appreciated.
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Emily from SWISCO responded:
September 29, 2021

Hello there!

We'd be happy to help, but we'll need to see the handle set and mortise lock in question to compare to our inventory.

Thank you! 
Storm Door Mortise Latch
Storm Door Mortise Latch
40-198
$42.47
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