F stamp on S770

A contractor from New York says:
I need a 20" Series 770 balance. My window sash has an F stamp but your catalog only goes to E.
Can you get it for me. I need 2.
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Jasmine from SWISCO responded:

Thanks for reaching out! I've forwarded a quote with a link for the (2) requested balances as this will need to be a custom order. You may use this link to review the pricing and to place the order from your online cart.

Be sure to check your spam/junk folder if you do not find the link in your primary inbox.

Please let me know if you have any questions.

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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