SWISCO - The Replacement Hardware Authority

Channel Balance 3606 and NK BSI what option?

A home owner from Florida says:
Confirming part to order.
Stamped on metal- 3606 and NK BSI. Body (metal-steel) is 37" long and 1/2 inch ide.
This looks like your Series 380 with 19-005 top and 15-005 shoe. Both top and shoe have wings.

Also, did not understand what the options were on your description sheet. Do I need them? Which one

Thanks for your help!
Bob
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Tom from SWISCO responded:
Thanks for posting, Bob. The options are indicative of your balance's strength--that is, how heavy a sash your balance systems can support while working in tandem. This is usually determined by your stamp, but we do not have any options that correspond with your stamp of 3606. If at all possible, please tell me the weight of your window sash. You can find this out by removing the sash from your window and placing it on a scale. Let me know!
A quick learner from Florida says:
Tom,
I checked the stamp and it did say 3606.
The weight of the sash is 45lbs.

Thanks for your help!
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Tom from SWISCO responded:
Thank you. Choose the S380-37 with the 3670 option.
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