Tilt-out single hung window latch

This pair of plastic, spring-loaded latches is 2-3/4" long x 5/8" wide x 7/16"deep, and has a tongue that springs into the window channel to keep the window from tilting out. It is set into a channel at the top, left and right edges of the window to be almost flush with the top of the sliding window frame. Can you help me identify this part? I need a pair.