27CBlock and tackle window balances.

A quick learner from Dallas, Texas says:
November 11, 2020
Block and tackle window balances for 38 aluminum Ademco windows. The channels measure 28" long. Most the the windows are missing the entire balances.
They have 27C stamped on the channels.
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Bob from SWISCO responded:
November 16, 2020

Do both nylon fittings on either end lack wings, or 'tabs' to each side? If so, see either our S351-28 or S390-28. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. A stamp code of 27C conforms to our stamp option of 2730. Let me know if you have further 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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