balance identification

A handy person from San Francisco says:
Happy New Year to you!!!
My name is Aleksey and I am looking for replacement for my window balance.
Thank you
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Bob from SWISCO responded:

Hello there. Is the metal channel, not including the shoe, 27" long? If so, see our S751-27 . Note that the S-Clips that attach the top to the window track are sold separately. To know what stamp option to select, obtain the exact weight of the window sash, then match that exact weight with one of the weight ranges listed alongside each stamp option on the balance shop page. 

How to install a ribbed tilt channel balance with knife lock shoe
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