Which stamp option do I need?

A quick learner from Dania Florida says:
December 30, 2021
My current channel balance has 2316 stamped on it. My high impact window sash weighs 38 pounds. Which stamp option should I be using. I need a 19-002 top & a 15-001 bottom; the channel balance is 24 inches long.
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Bob from SWISCO responded:
January 5, 2022

Thanks for posting. This is not a standard Series 390 balance, given that 2316 stamp code, which indicates a unique spring calibration. I'm confident we can provide these balances for you via custom order. My product director is looking into having these balances quoted. We'll get back to you as soon as we can with more information. Many thanks. 
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Bob from SWISCO responded:
January 11, 2022

Thanks for your patience as we prepared this quote for you. I just sent you an email with a custom link to order a pair of these balances stamped 23-16L. Let me know if you have any questions prior to placing this order. Many thanks. 
24" Series 390 Channel Balance
24" Series 390 Channel Balance
S390-24
$10.55
Channel Balance Top Guide
Channel Balance Top Guide
19-002
$0.74
Channel Balance Shoe, 1-1/8" Depth
Channel Balance Shoe, 1-1/8" Depth
15-001
$0.74
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