Replacing Caldwell window channel balances

A quick learner from Jacksonville, FL says:
October 8, 2020
I have 4 Caldwell window channel balances I need to replace. They are all stampped with "28 3 Caldwell HM". All of them are1/2" wide and 9/16" deep. Please tell me which one to buy. Thanks
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Bob from SWISCO responded:
October 12, 2020

See our S351-29 or S390-29, depending on the depth of the bottom nylon shoe. You will need a stamp option of 2830. 
29" Series 351 Channel Balance
29" Series 351 Channel Balance
S351-29
$11.10
29" Series 390 Channel Balance
29" Series 390 Channel Balance
S390-29
$11.10
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