tilt-in release catches on existing, aging replacement windows in use in the house when we bought it.

There are no names, numbers, or markings on these parts. They appear to be able to be assembled and used on either side of the window; but if a suitable replacement is side-specific, I need 2 each of left and right. There are only 2 windows in the house using these particular tilt-in catch releases. Also, a "LOCK" capability (visible in photo of installed part) is not vital in an otherwise suitable replacement part. Thank you.

The overall perimeter dimensions of your suggested replacements look similar to mine; but the distance on center between fastener holes on my existing parts is 2-5/8", not 2-7/8" as on yours; and the distance from the striker end to the near mounting hole on center on mine is 9/16", compared with 7/8" on yours. So I would be forced to re-drill mounting holes to accommodate yours, unless you have a more exactly sized replacement to mine. Not the worst outcome, unless you can suggest better...

Or, do you have available this internal sliding latch part for my unit? See attached photo, and I will send additional measurements if you do have something like it and need them. This part is the whole trouble--the pointy end breaks off when I attempt to tilt the sash in. Crazy glue will suffice to hold it together, but it will re-break whenever I tilt the sash in. I do not wish to replace these entire windows over this issue! Thank you for your perseverance.