Window balancer in LR

A quick learner from San Diego says:
December 15, 2020
The balancer is 30" long and 1/2" wide with 29 9 HS CALDWELL markings. What is the replacement part for this?
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Bob from SWISCO responded:
December 16, 2020

I'm confident we can help, but we need more information to help ID the balances you need. See the video below. In addition, we'll need the exact weight of your window sash to determine the stamp option your new balances need.
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