Help with identifying a balance

A quick learner from USA says:
October 2, 2014
hello we have some visions 2000 doublhung windows and are trying to find replacement balances like the one in this picture. We need 21HD,20HD,14HD,15HD any help you could offer would be great. Thanks your pal, Matt.
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Paul from SWISCO responded:
October 2, 2014
Thank you for posting. I have received your image. I have related some balanced on the right side of this page that I think will work for you. Those codes you listed are the same as the options you will need to choose for each. Take a look at them and see if they will match.
22" Series 751 Channel Balance
22" Series 751 Channel Balance
S751-22
$10.66
21" Series 751 Channel Balance
21" Series 751 Channel Balance
S751-21
$10.56
15" Series 751 Channel Balance
15" Series 751 Channel Balance
S751-15
$10.18
16" Series 751 Channel Balance
16" Series 751 Channel Balance
S751-16
$10.45
How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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