Old Andersen parts

A home owner from Algona, IA says:
Hello, I believe that I need to use the brass thumb latch, 82-241 , and the older style mortise lock 82-263 . I do not want to upgrade the mortise lock and thumb turn.

***My question is...can you please tell me what the item number would be for the "other side" of the brass thumb latch that works with 82-241 that you would put the key in?

***Also, after looking at these pictures I attached, can you tell me if im on the right track in what I need to order?

Thanks Renee
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Tom from SWISCO responded:

Thanks for reaching out to us. Are you asking for the key lock that matches the 82-241 ? If so, that would be the 82-319 (right hand) or 82-318 (left hand). You can see these on the 82-241 store page under "Related Items).

I do agree that the 82-263 is a great match for your original mortise.

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