Window balance vinyl window

Question

I have a 35 inch balance with the numbers, 3405 on it and r002. The windows are 20 years old. I included some pictures, hoping they would help. Can you tell what size I need to replace them?

Emily · Accepted Answer

Thank you for reaching out to us! Your balance looks like a match for the S380-35 or S385-35. The best match will depend on the depth of the bottom shoe, so you'll have to measure as shown below.

Your stamp is strange, however. Can you weigh the window sash on a scale and tell us what you get?

Comparison of the S378, S380 and S385 balance shoes.