Need 2 spring replacements

A handy person from Rothschild says:
I have double hung tilt window with a broken spring. I don't know if I need new 3D335 picture number part? I would like two spring replacements so they ware the same. Also don't have a tool to load them. Want to make sure I'm getting the right parts. Also broke the plastic piece that goes over the top and not sure if you have them.
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Casey from SWISCO responded:

Hello,

We'd be happy to help but we'll need to confirm the diameter of the spiral balance tube, which would be either 3/8 or 5/8". If you need to pivot shoe as well, we'd need to see a photo of it removed from the window, including the exact width and depth of the shoe. Thank you!

A handy person from Rothschild says:
I don't believe I need pivot shoes. I can see the spiral balance is broke so not going to cut out pivot shoe unless I could see it's broke. I'll take a picture of the balance tube measurement. It seems way bigger than 3/8 but not quite 5/8? Closer to 5/8.
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Casey from SWISCO responded:

It looks like your tube might be closer to 5/8" in diameter. If so, take a look at our S600-22 spiral balance with a red tip strength option. You may also want to consider purchasing a 75-006 charging tool. Thanks for posting!

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