Block &Tackle part identification

A home owner from USA says:
March 20, 2018
Hello,
I have attached 4 photos of a window part I need to find and replace. The part number as shown on the part is DB 102 24 HD.

Thank you.
Jeanne
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
March 23, 2018
Thanks for posting, Jeanne. I think we can help replace this, but before we can recommend anything, please let me know the length of the metal channel. I would also like to know how many of these balances you need. 
A home owner says:
March 23, 2018
Thank you Paul for your response and help.

Length is 25.0"

I *think* I need 7-8 replacements but I need to confirm. I've been trying to find this part for the last 3-4 years!
I was thinking of ordering just one making sure it works but I don't recall if each window requires one or two pieces of this part for the window to work properly?

Thanks again.
Profile picture of Paul
Paul from SWISCO responded:
March 27, 2018

Perfect, thank you. Most window sashes use two balances, one on each side. We always recommend replacing both at the same time. I will send you two order links, each with a different quantity: one for 2 and one for 8. That way you can go with whatever you feel more comfortable with.

I would also recommend the 19-030 long S-clip, which is sold separately. However you can also just re-use your old S-clip if it's not damaged.
Black Locking Terminal, Great Lakes
Black Locking Terminal, Great Lakes
15-197
$2.04
Long S-Clip
Long S-Clip
19-030
$0.70
25" Series 751 Channel Balance
25" Series 751 Channel Balance
S751-25
$11.25
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