I know this as a night latch
Hello,
I believe that this is a small part of a larger piece of hardware. If you could show us what the part in your photo interacts with, we'd be happy to let you know if we carry a suitable replacement. Thank you!
Thank you, this photo tells us what we needed to know. It looks like you're looking for a take out clip that, unfortunately, has been discontinued for quite some time. At this point, there is no known substitute for us to recommend.
Your best bet would be to continue looking for a small hardware store that might have backstock of this part. I'm sorry that we're unable to assist you but we wish you the best of luck with your repair.