10in channel balance

A home owner from Seattle says:
August 29, 2020
Marked with "BSI 9 C". Both top-guide and bottom shoe are non-winged.
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Bob from SWISCO responded:
September 2, 2020

We don't carry balances of a length this short in our standard inventory, but I believe we can still help via a custom order. I just need you to clarify one detail. This looks to be either a Series 351 or Series 390 Channel Balance, depending on the bottom nylon shoe depth. The pictures below depicts the difference. The Series 351 shoe is 1" deep, while the Series 390 shoe is 1-1/8" deep. Compare with your balance, and tell me what matches best. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
A home owner from Seattle says:
September 12, 2020
Looks like the 390, the shoe is 1-1/8" deep.
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Bob from SWISCO responded:
September 14, 2020

Perfect, thanks. I just sent you an email with a custom link enclosed to order (2) of these 10" Series 390 Channel Balances, stamped 930 (which means they are calibrated to support a window sash in the weight range of 9 through 11 lbs). Let me know if you have any other questions prior to placing your order. 
Channel Balance Shoe, 1-1/8" Depth
Channel Balance Shoe, 1-1/8" Depth
15-001
$0.74
Channel Balance Shoe, 1" Depth
Channel Balance Shoe, 1" Depth
15-002
$0.74
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How to Replace a Channel Balance Attachment
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Classifying Channel Balance Fittings
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