Need replacement parts 2420 window channel balance

A home owner from Olathe, Ks 66062 says:

I am a home owner and I need some replacement window channel balances.

See picture attachments to show you how they look. The number is 2420. Our house was built in 1979. Manufacturer is unknown. I have 2 windows I need to fix. I hope the ends are assembled.

Hoping you can help.

Rex

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Casey from SWISCO responded:

Hello,

It looks like you have either our S351-25, with a 15-002 bottom attachment, or S390-25, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to know the length of your balance and the weight of your sash in order to choose the correct option.

Choose the 2420 spring strength option based on the stamp on your balance.


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