balance block and tackle

A home owner from Zachary says:
October 15, 2017
Help. I have 7 windows in my house that the balance block and tackles have broken. I need to replace them, but I am not sure the proper replacement part. The only stamp is 3940 on the bottom rail. The parts are 40" metal to metal, and 5/8" wide. I have attached pictures of the ends. Thanks.

Lee
User submitted photos of a window balance.
Profile picture of Casey
Casey from SWISCO responded:
October 20, 2017
Greetings Lee. See if our S395-40 channel balance with a 3940 option would make a good replacement for you.
40" Series 395 Channel Balance
40" Series 395 Channel Balance
S395-40
$14.01
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