Spiral balance

A quick learner from Mississippi says:
Looking for 3/8 spiral balance for tilting window. The metal measure 27.25. They have plastic cover on them that measure 28.5. The connector color looks to be white or light yellow. Which part number and length do I order?
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Emily from SWISCO responded:

Hello!

Your outer tube's diameter looks to be 5/8", so we recommend the S600-29 with the red tip option, which supports a sash weight of 7 to 29 pounds. You may want to weigh your sash on a scale and refer to the chart under the product description on the S600-29 store page to confirm that this option is appropriate for your sash. 

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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