Replacing 2390 BSI 26 balance

A home owner from California says:
Hi, there. I have a non-tilt aluminium Milgard sash window and one ofnthe balances went out.

The stamp on it is 2390 BSI 26.
The length of the metal part is 24".

Which part shouldninorser please?

Thank you
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
Profile picture of Tom
Tom from SWISCO responded:

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.
Comparison of the S351 and S390 balance shoes.

A home owner from California says:
Many thanks. It is 1-1/8". Should I concern myself with the weight of the sashe? Or the S390 spec corresponds to 2390 BSI 26 designation?
Profile picture of Tom
Tom from SWISCO responded:

The weight option is very important, yes. Your old stamp of 2390 is a little outdated, but you can weigh your sash on a scale and refer to the chart on our balances' store pages to verify the best one for the job at hand.

How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to replace a channel balance
How to replace a channel balance
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.