Channel Balance Replacement

A landlord from Norcross, GA says:

I need to replace a few channel balances for the aluminum windows at my rental properties. I found the 24" and 28" series 730 channel balances being the closest match. However, I noticed the balance shoes are not the same. Could you take a look at the attached images and advise what I should order?


user submitted photo of channel balance
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Mike from SWISCO responded:
Good afternoon, Hong.

We can absolutely provide you with the proper replacement channel balances. Yours, however, may require a custom balance.

Before we move on, can you give us any markings or stamps on your channel balance?
A quick learner says:
24" has a stamp: 2330
28" has: 2730

BTW, a year or so ago, I bought a bunch of replacement balances from a local store and found out they are one inch longer each, which made the installation quite challenging.
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Donna from SWISCO responded:
You might have Series 390 balances, compare the measures of the shoe to the measurements we have online for the 15-001, Balance Fitting especially.

If it is Series 390, both 24" Series 390 with stamp 2330 and 28" Series 390 with stamp 2730 are available online.
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