Please help with balance part number

A home owner from USA says:
October 2, 2017
The numbers on the balance is 17 2 Tk. The length of the balance is 18" long.
Channel Balance
A home owner from Please help with balance part number says:
October 2, 2017
The windows are from 1992.
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Casey from SWISCO responded:
October 6, 2017
Hey there! It looks like you need our S377-18 with a 1720 stamp option. To be certain about that stamp option, remove your window sash and place it on a scale and see where that number falls on the table posted on the product web page. A pair of S377-18 with stamp 1720 will carry a window sash weighing from 8 up to and including 12 pounds.
18" Series 377 Channel Balance
18" Series 377 Channel Balance
S377-18
$9.34
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