2640 caldwell spiral balance

A quick learner from usa says:
Can you please advise which part number would be an adequate replacement for these window springs? See attached images.
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Tom from SWISCO responded:

Thank you so much for reaching out to us. We can definitely supply this balance as a custom order. Before we can go further, though, I just had a few questions that I needed you to clear up.

First, can you confirm exactly how many you wanted to purchase?

I also see that your old balance has a gray tube, but your window is white. We can supply these with a white tube, if you'd prefer. We can also just stick with gray if you don't want to make any changes. Just thought I'd ask!

Once you've gotten back to me, I'll email you a purchase link and price quote that you can use to place an order on our site.

A quick learner from usa says:
White would be great. I'll need 6 of them.
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Tom from SWISCO responded:

Perfect. I'm going to shoot that purchase link to you right now. Please let me know if you had any follow up questions about these.

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