New lock

Hello,

Take a look at the 82-316 Andersen key lock used with the 82-043 thumb latch. 

Alternate view of 82-316

Alternate view of 82-316

Alternate view of 82-043

We also offer the 82-037 lock commonly used with this assembly. 

Alternate image for 82-037

Detail of receiver 82-037

However, your photos resemble the 82-263. You may want to remove the old lock and compare the specifications to confirm the best match. Thanks for posting! 

Alternate image for 82-263