Channel Balance with Shoes

A quick learner from portland oregon says:
I don't see any stamp on the Channel Balance with Shoes. which option should I go for?

length measure is 25 3/4". should I buy 25" or 26" Channel Balance with Shoes?

please advise.
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Tom from SWISCO responded:
First, make sure you're only measuring the metal channel. Do not include the nylon attachments in your measurement. If you are, and you're still getting 25-3/4", please take a few pictures of your balance for us to see. You may need something special.

Second, what is the weight of your window sash? That will help us determine the appropriate option.
A quick learner says:
I have found the number on the channel balance. would this good enough for weight?

please see attach
A quick learner from portland, oregon says:
I have double check my measurement and it is metal to metal. between 25 5/8 or 25 3/4 (please see attach picture)

I also have another smaller one and it's 15 5/8 to 15 3/4 as well. (picture attach)

I have found the masking stamp on it as show in picture.

please advise for replacement part order.
User submitted a photo of a window balance.
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Donna from SWISCO responded:
Thanks for replying with detailed photos, this is everything we need to get started. I will email you custom balance ordering links shortly.
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