Vent Latch replacement- Simonton double hung windows

Hi,

I am hoping to purchase a replacement part for my Simonton windows.
Two of the vent latches have broken. I would like to purchase six latches so we have replacements for the future.

See attached pictures. There are two markings I see. One is a "D" inside a circle and the other is a "29" on the transparent side.

Thanks,
Ross