Need help determing if this is a Series 380 or 385

Handy Person from Seattle
I'm looking for replacement channel block and tackle window balances (2), but I'm confounded if I need the 380 or 385 series. This is for a vinyl sash bathroom window where the cord has been shredded in the pulley mechanism. The metal channel is 13 inches, and the top guide and bottom shoe have wings. The only stamp reads "12 3 GW CMC 7". I can find no manufacturer information or markings. There is no stamp for the weight range (unless that's what the 7 indicates on the stamp), but the window weight is approx 7.5 lbs, so option 1220 should be correct. I'm unable to share photos of the balances installed, but have attached several photos from different angles of the removed balances. Additional photos available on request.
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4 Replies
Emily
Emily from SWISCO
SWISCO
Expert

Thank you for reaching out to us. I agree that either the S380-13 or S385-13 would be what you need. However, I'm afraid I can't confirm which one you may need from photos. It's hard to make out accurate dimensions from photos alone. With that said you will have to measure as shown below and use your best judgment. 

We usually recommend sticking with the stamp that your old balance was designed to use. However, if you've been having trouble opening and closing the window then we recommend weighing the sash on a scale to confirm the proper stamp option. 

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

Handy Person from Seattle
Thank you for your response Emily. You've included a photo that shows the correct way to measure the shoe width (this wasn't obvious from the previous content I viewed). I've done this, and while close to 1 inch, it's obvious it's a bit longer -- though perhaps not as much as 3/32 longer. Still, it'll be easier to trim to fit by sanding if it's too long, so I'll go with the 385. I appreciate your time!
Emily
Emily from SWISCO
SWISCO
Expert

It's my pleasure to help. We truly appreciate your business! Let me know if I can be of further assistance and best of luck with the repair! 

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