Window balance

A home owner from Jacksonville, FL says:
I need 3 of these balances, but am unsure of which color tip is needed. Are there any other parts needed for install?

Thank you!!
User submitted photos of a window balance.
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Tom from SWISCO responded:
Sure, I think we can help. Can you confirm the diameter of the outer tube? If it's 3/8", I recommend our Series 900 spiral balance. If it's 5/8", I recommend our Series 600. For the tip color, I recommend weighing your sash on a scale to confirm the best option. Finally, you may find our 75-006 helpful for installation. See our related video for more information.
A home owner from Jacksonville FL says:
The sash weighs 18.2 lbs
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Tom from SWISCO responded:
You still need to measure the diameter of the tube to choose a Series. As well, can you confirm that the tube is 28" long?
A home owner from Jacksonville FL says:
It is 28" long but the spiral seems to be longer on the broken ones.it is 3/8
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Paul from SWISCO responded:
What is the diameter of the white plastic tube over the spring? The tube length, not the spiral length, determines the length of the balance, and the diameter of the plastic, not the metal, is how you measure the diameter.
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
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How to adjust a spiral balance on a tilt window
How to adjust a spiral balance on a tilt window
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How to choose the proper spiral balance tip color
How to choose the proper spiral balance tip color
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