Sliding window lock

This looks to be an older design bolt for a screen or storm panel. The bad news is that these kinds of bolts are hard to get a hold of these days, since such panels aren't used as often. We do still sell a small selection, which you can see here, but there is a fair chance we won't have a good match.

I can try to narrow down the list of possibilities for you, but before I can I'd like you to show me an undamaged version that's been removed from the frame. I'd also like its precise dimensions, if you can get that for me. Thank you!