Searching for 3249 BSI

A quick learner says:
Looking to buy at least 8 of these for my windows. The Measurements are 3240 BSI .
Please advise.

Hb
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Bob from SWISCO responded:

I'm very confident we can help, but that stamp code only tells us the strength of the balance. To know its identity, can you show us the attachments or nylon fittings on either end? Their style will tell us this balance's identity. Many thanks. 

A home owner from Fort Lauderdale says:
Thank you Bob, I'm not sure what you're asking for, but attached see more photos.

I look forward to hear back from you soon.

Thanks again;

Hb
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Bob from SWISCO responded:

Thanks for getting back to me, Hb. This is exactly what I needed to see. You have either an S380-33 or S385-33 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. In either case, for a stamp option select 3240. 

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