Replacement part needed
This part is called a channel balance. We can replace it, but I'll need a picture of the clip or hook that was at the end of the cord. That would allow me to confirm what you need. I will also need to know the stamp printed on the metal channel and how many you were looking to purchase.
The stamp is 40S36
It's a S hook/clamp at the end , block and tackle, 41 inches.
We need just one if possible
We do have a number, but I don't think talking on the phone is going to get to the bottom of this. We absolutely need to see the clip that was at the end of that cord. No amount of verbal description will do it, I'm afraid. Do you have an identical window elsewhere in the house that may still have its balance hardware? Without seeing how your balance attaches to the shoe, we don't know what balance to to make for you. Without that photo, we won't be able to proceed.