Did not find any names or markings we just bought the house and this was broken
A quick learner from Bethany, Oklahoma says:
January 16, 2019
It the one the lock hooks into to lock the door. I will send a picture of the lock but the part that is broken half of it is missing. This is what the part looks like that supposed to go into the other part to lock.
Bob from SWISCO responded:
January 16, 2019
Thanks for posting. Take a look at the the 89-021, the 89-020, and the 89-021D. I think any of these might work for you. Take a look and see what you think.