What is the correct sash weight range?

A quick learner from Bokeelia, FL says:
We have Norandex windows and need window balances. Number stamped on balance is 3635 BS1. We looked at the part S380-37 but do not know the option for the sash weight range. Can you recommend which one please? Thank you.
A quick learner from Bokeelia, FL says:
The window balance is 37". What other measurement do you need?
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Paul from SWISCO responded:
Your stamp is a little unusual. Can tell me the weight of your sash?
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