Please ID these channel balances

A quick learner from Cape Coral says:
Hello,

These are from two similar windows. The sash measures 34" X 25" for the larger one and 34" X 19" for the smaller one.

The channel balance measures 9/16" in width. The long one is 24" in length and stamped with 2320. The short one is 18 1/2" in length and stamped with 1820. The shoe is winged and is 7/8".

The are out of older aluminum, non-tilt windows.

Thanks so much.
Profile picture of Casey
Casey from SWISCO responded:

It looks like you have our S377-24" balance with the spring strength option 2320. Can you double check the length of the 18.5" one? If it really is 18.5" from metal edge to metal edge, we might have to make a custom balance for you. Just confirm the length you need and let us know how many pieces your require. We'll send you a quote for a custom balance.

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 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
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
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 3-4 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.