replacement widow channel balances

A handy person from Franklin, TN says:
September 20, 2017
I have several windows where the channel balances have failed. They all look the same except are different lengths. I need one 31HD, 6 27TG, and 2 27C.

Is that enough to determine which channel balances I need?
Channel Balance
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Tom from SWISCO responded:
September 26, 2017
We should be able to help, though this balance will need to be custom made. Before we begin, can you show me a clear picture of how this balances attaches to the window jamb at the top? Can you also tell me the weight of the sash for each case? The stamps you gave usually tell us that, but the first two are a little different from what is normally used on this balance and I want to confirm.
Heavy Duty Pointed Hook
Heavy Duty Pointed Hook
62-105
$0.74
27" Series 770 Balance
27" Series 770 Balance
S770-27
$12.70
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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