PennCo window balance

A contractor from Greenwood, SC says:
Window balance for PennCo window.
Stamp reads: UNIQUE 27-C-30.
Actual metal channel measurements:
28"L x 1/2"W x 1/2"D inside channel.
J-Hook type string end.
Used with your product # 15-208 pivot lock shoe
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Bob from SWISCO responded:

Thanks for your patience during this busy season. I think we can replace this balance for you, but it will have to be a special order due to its unique design. I believe you need the S770-28 with the 62-105 hook swapped at the bottom. You potentially will need the 28C stamp option, but that will depend on the weight of your window sash. If that information looks okay thus far, please give us the exact sash weight, as well as the number of balances you'll need. From there, we'll try and get this started for you. Many thanks.

A contractor from Greenwood, SC says:
Bob,
Yes, all of that information looks correct. The window sash weighs 17.65 lbs.
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Bob from SWISCO responded:

Thanks for getting back to me. I am sending you an email with a custom link to order (2) of the S770-28 with the 62-105 hook attached, and with a stamp option of 28C. If you have any questions, or need a different amount, just let us know here in the discussion thread. Let me know if you have any other questions.

A contractor from Greenwood, SC says:
Thanks so much for the help and the link!
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Bob from SWISCO responded:

My pleasure! Let me know if you have any other questions. Many thanks for considering our business, we really do appreciate it.

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