trying to replace window latches

Hi,

We moved into our house two years ago; in that time, the latches on about a dozen windows have broken partially or completely. The metal seems very brittle and light-weight, and the windows are probably a few decades old. There are two latches on each window, and we have no idea what brand the windows are (they have no info etched into them, for example.)

I tried picking up replacements at a nearby Lowes, but the smaller piece - the piece attached to the upper window - was too deep on the ones they had. As you can see from the photo, on ours it is less than 1/4" deep, and I haven't found a match.

We're hoping to replace some or all of these this fall, as the windows don't seal well without them.

Thanks!
David

The holes on the inside/lower window appear to 2 1/16" apart, center to center. On the outer/upper window, they are about 2 1/8", slightly further apart.

Thanks!

David