Hello,
It looks like you have the 70-191 Andersen screen latch. It looks like you are also showing a broken corner, which we have actually been researching for another customer. So far, we've come up empty but we'll let you know what we find out once more information is available.
We just heard back from Andersen regarding this corner and, unfortunately, it cannot be purchased separately from the actual window. I'm sorry that we won't be able to provide a replacement for the rest of the part you're looking for but please let us know if you have any other hardware questions.
