Is my mortise lock too big?

A home owner from Saint Joseph says:
Dear customer Service Representative,

I apologize, the package with the screws, tube nuts, and keys had dropped when I opened the package.

I do have a delemma , the mortise is slightly larger than my opening, do you have any suggestion? Did I order the wrong part?
User submitted image of their door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Thanks for posting. Looking at your picture, the 82-218 appears to be the best match. See our video below on installation. This shows you how you can install it without it dropping into the door.
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