2310 Sash balance

Thanks for your photos. Based on what I see here, you have either our S351-24 or S390-24, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S351 and S390 balance shoes.

You're very welcome! Please reach out if you had any other questions.