older windows plastic hardwares in both sides to hold window open

Hi Myrthel! I'm not able to determine what you'll need to replace based on the description given. I'll need a bit more information to be able to make an accurate recommendation.

It sounds like you could be speaking about the shoe from a balance assembly however, I cannot confirm for sure. Would you be able to provide us with some photos of the hardware you are having an issue with?

Thanks for reaching out. The shoe you have pictured here is our 15-209. Take a look over the dimensions and compare it to your original to confirm.

Profile view of 15-209

Alternate view of 15-209

We do not carry the balance or any of the other associated hardware, unfortunately.