Alcoa window balance

A quick learner from Brunswick, MA says:
I need multiple balance spring. 3/8 diameter, blue tip, 24"
Please send me a art number. The plastic cover over the balance spring also broken.
Thank you
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Casey from SWISCO responded:

Hello,

If the broken plastic cover shown in your photo has a diameter of 3/8", see the S900-24 spiral balance with a blue tip option. Thanks for posting!

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