Block and tackle balancer with no part numbers

A home owner from Morton Illinois says:
Here are some photos of a balancer that needs replacing. Please see if you can identify.
Thumbnail of the uploaded file named balance connector inside.jpg
Thumbnail of the uploaded file named balance bottom connector outside.jpg
Thumbnail of the uploaded file named balance top connector.jpg
Thumbnail of the uploaded file named Balance 1.jpg
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Tom from SWISCO responded:

We can supply a balance that matches this, but it has to be a custom order due to its configuration. Basically I plan on setting you up with a Series 795 but it uses the smaller 1" wide 15-194 shoe instead of the default, and a 15-198 hook instead of the screw clip it already comes with. Does that look good to you?

Before I can pull the trigger on this, can you double check to see if there is a stamp printed on the metal channel? If there is no stamp then I will instead need the exact weight of the sash, down to the ounce. Can you also confirm the length of that channel? I can't quite tell what it is from your photo. Please also tell me how many you needed altogether.

Once I have that information I will email you a purchase link and price quote that you can use to place an order on our site.

A home owner from Morton Illinois says:
I found more information on the unit. It has BSI 37D stamped into the metal.
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Tom from SWISCO responded:

Thank you! That's a huge help. Does that mean that the metal channel length is indeed 37"? Can you also give me the quantity that I requested? I'm ready to get the ball rolling on these, I just need the rest of that information.

A home owner from Morton Illinois says:
yes it is 37 inches. I believe that I will replace both sides of the window so please quote on 2.
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Tom from SWISCO responded:

Great. I'll get that out to you now. Please let me know if you had any other questions!

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