Need replacement channel balances for multiple windows

A home owner from Winter Haven Florida says:
April 7, 2024
I have a total of 14 windows that have rusted channel balances. I have included photos for one of the windows, but am including the other part numbers listed on the channel balance, their length and quantities needed. All windows are NUAIR and seem to be the same model family, just different sizes:

K 2830, 29" - Need quantity 8 for 4 windows

K 2230, 23" - Need quantity 4 for 2 windows

J 2230, 23" - Need quantity 2 for 2 windows

Note that the J 2230 is hung next to a pair that uses K 2230. Not sure why those are different.
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Bob from SWISCO responded:
April 7, 2024

Thanks for posting. All these balances look like either a Series 380 or Series 385. The difference between these two balance Series is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. Compare with the diagram below to determine which Series you need.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

For the 29" balances, use either the S380-29 or S385-28, stamped 2830. For the 23" balances, use either the S380-23 or S385-23, stamped 2230--the 'K' and 'J' are just manufacturing info and isn't relevant to the replacement. Let me know if you have any questions. 
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
29" Series 385 Channel Balance
29" Series 385 Channel Balance
S385-29
$11.10
23" Series 380 Channel Balance
23" Series 380 Channel Balance
S380-23
$9.59
23" Series 385 Channel Balance
23" Series 385 Channel Balance
S385-23
$9.59
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