coil balance spring

A quick learner from Gainesville says:
#7 is stamped on the balance spring from the single hung window. The unit is 1 1/2" wide x 2 1/2" high overall (to outside of prongs) x 1/2" deep.
Once identified, we'd like to order 3 pairs.
Thumbnail of the uploaded file named pivot shoe blue cam
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Emily from SWISCO responded:

Thanks for reaching out to us! Our 15-087 looks like a good match but take a look at the specifications and see what you think. I also recommend the S180-7 7-pound coil spring based on the stamp. 

Let me know if you have any questions! 

A quick learner from Gainesville says:
Hi, Emily.
Is the coil hosing pivot replacement necessary, as can the springs themselves be switched out?
Bill
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Emily from SWISCO responded:

You only need to replace what's broken, so you can certainly reuse the pivot shoe if it's in working order!

A quick learner from Gainesville says:
Great. Walk us through just ordering the S180-7 springs, 4 of them for now.
Bill
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Emily from SWISCO responded:

To place an order for the S180-7, you'll want to go to its store page, click "Add to Cart," and then click the shopping cart at the top right hand corner of the screen. Don't forget to set the quantity you need.

You can also place an order by calling (888) 991-1929. 

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