Channel Balances

A home owner from Oregon House, CA says:
My balances, which need replacement, have the printing 31 5 CX CMC 7. See no other numbers. The metal channel is 32 inches in length. Pics attached. Can you please advise the correct replacement balances.

User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! Just by eye-balling your attachments, I recommend our S385-32 channel balance. Take a look and compare it to your own hardware. Does that look about right? Based on your stamp, I'd also recommend our 3250 option. Let me know what you think.
A quick learner says:
Yes, I think it looks the same. I was unsure as to the weight option so that is really helpful. Thanks you and will get ordered.
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