Window sash balance

A quick learner from Hollywood, FL says:
Trying to find the part required. The stamp says 2930 but I don't know what caps I have.
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Casey from SWISCO responded:

Hello,

It looks like you have either our S351-30, with a 15-002 bottom attachment, or S390-30, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 2930 spring strength option for your replacement balances. Thank you!


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