Sliding window latch cover
Thanks for posting. I'm afraid we don't have a match for this window latch. The closest match we have is our 90-252, which is a very similar mechanism it seems, but also a bit wider. Its corresponding cover, the 90-253, is therefore also seemingly too big for what you need. You might be able to replace this entire set up with both the 90-252 and 90-253, but I cannot be certain. Take a look at these parts and let me know what you think.
I believe you'll need the 90-255 Face Mount Strike based on the design of your keeper. Take a look over the dimensions and design from the diagram below to confirm that this is the right fit. You'll especially want to compare the dimension for the distance between the installation hole slots.