Replacement spring balance

A quick learner from Atlanta, GA says:
July 15, 2019
I think I've found the right replacements but I want to be sure. They look like 351. No wings on either top or bottom and a 1" shoe. There are two window sizes. The larger window balance has a 27 C stamp and the smaller has 27 B.
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Tom from SWISCO responded:
July 19, 2019

It looks like you have either the series 351 or series 390 channel balance.

The difference between the two series lies in the bottom shoe.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

The series 351 channel balance has the 15-002 shoe while the series 390 channel balance has the 15-001 shoe.

The 15-001 shoe is 1/8" larger from front to back.

I hope you find this helpful. Please let us know if you have other questions.
28" Series 351 Channel Balance
28" Series 351 Channel Balance
S351-28
$10.97
28" Series 390 Channel Balance
28" Series 390 Channel Balance
S390-28
$10.97
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