Single pane no tilt window replacement parts

Thanks for reaching out to us. I'm afraid I don't recognize the part in your first few photos. Can you show us what it looks like installed? Knowing the function may be helpful as well. 

As for the balance, would it be possible to see the shoe it uses and how it connects to the shoe? 

Thank you for waiting while we looked into this. Unfortunately, we don't sell replacements for the hardware you're searching for. We don't know who might, sadly. Contacting the original manufacturer of the window may be your best bet, whoever they may be. I am very sorry that we can't be of help with this repair; please let us know if you have any other hardware questions.