Identify Window channel Balance

A quick learner from Florida says:
May 22, 2020
Hi, I'm looking to find complete replacements for both window channel balances on a window. The only markings I see on them are 1720 on one and 1740 on the other. TIA
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Tom from SWISCO responded:
May 26, 2020

Based on your photos, you have either our S390-18 or S351-18. The only difference between them is the size of the bottom fitting, which is indicated on their respective store pages. You'll need to measure your bottom fitting to confirm which one is best.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
18" Series 351 Channel Balance
18" Series 351 Channel Balance
S351-18
$9.34
18" Series 390 Channel Balance
18" Series 390 Channel Balance
S390-18
$9.34
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