Looking for this piece to repair some old single hung windows

Thanks for posting. This latch looks a little like the 90-034, 90-293, and 90-317. It will come down to the side profile shape and dimensions. Compare the diagrams below to your old hardware and see if you think one of these matches what you need.

Profile diagram of 90-034

Reverse side of 90-034

Alternate image for 90-293

Dimensions for 90-317 Spring Latch