Balancer

Hello, thank you for posting,

It appears you have either our S351-29, with a 15-002 bottom attachment, or S390-29, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need.

To further review, are you able to provide the length of the metal channel excluding the nylon attachments? 

Comparison of the S351 and S390 balance shoes.

Thank you,

You will need a 34" balance. The original 33C stamp should translate to a 3330 stamp option that can support a 18 to 23 lb window sash. We recommend weighing the sash to confirm this.

Once you determine the Series needed from the diagram above, all pricing can be viewed on the product page. Please let me know if you have any additional questions.