Window channel balance

A home owner from 32317 Tallahassee Fl says:
April 30, 2018
Only markings appear to read 20 5 DN Caldwell.The length appears to be 21 inches and 1/2 wide. Looking for 2 replacement balances.
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Casey from SWISCO responded:
April 30, 2018

Hello,

It looks like you have either our S351-21, 15-002, or S390-21, 15-001, channel balance. Take a look at the image below to determine which balance you'll need. 

Let us know if you have any more questions. Thank you!

 
Comparison of 15-001 & 15-002
Comparison of 15-001 & 15-002
21" Series 351 Channel Balance
21" Series 351 Channel Balance
S351-21
$9.59
21" Series 390 Channel Balance
21" Series 390 Channel Balance
S390-21
$9.38
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