Looking to replace channel balances

A quick learner from Arvada, CO says:
March 15, 2018
I am looking to replace channel balances for two windows:

- 21-inch: 1/2-inch width, markings 20 4 KU CMC 7
- 15-inch: 1/2-inch width, markings 14 5 CV CMC 7

I've included photos of the parts I'd like to replace.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
March 20, 2018

I can't tell what balance you need, because I can't tell the depth of your bottom balance shoe. If it is 1", use Series 385, and if it is 1-3/32" in depth, use Series 385. For "14 5," the metal channel length will be 15", and the spring weight would be "1450." For "20 4," the metal channel length would be 21" and the spring weight, "2040." Check out the diagram below showing the two shoes.

Comparison of 15-004 and 15-005
Comparison of 15-004 and 15-005
15" Series 380 Channel Balance
15" Series 380 Channel Balance
S380-15
$9.34
21" Series 380 Channel Balance
21" Series 380 Channel Balance
S380-21
$9.38
15" Series 385 Channel Balance
15" Series 385 Channel Balance
S385-15
$9.34
21" Series 385 Channel Balance
21" Series 385 Channel Balance
S385-21
$9.38
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