Channel balance help

A quick learner from Florida says:
Hi need to replace channel balances on two windows. Both are 26" and I believe are the S377. Two different size windows and unfortunately I don't have a scale but they are heavy (Florida condo). So I'm thinking the 2540 or 2550. Attaching pics, if you can help - I'd appreciate it!!
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Tom from SWISCO responded:

I agree, our Series 377 looks like your best bet. However, your stamp uses an older rating system that I can't use to determine which one of our modern stamps would be best for you. I highly recommend getting the exact weight of your sash. It's not worth guessing in my experience.

A quick learner from Florida says:
Thanks - weighed them and got my order in. Fantastic service/tool that you have, really appreciate the great customer service!

Thanks,

Bob
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Tom from SWISCO responded:

Thank you, Bob! You're very kind to say so. If you ever need anything else, you know where to find us.

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