White Plastic Window Balance

A distributor from St. Louis, Missouri says:
Trying to find a replacement for a white window balance. The length of the white shell is 17", has a red cap, pins that are 7/16" apart. The number 1298 is stamped on the spiral metal piece of the balance. Do you have a replacement part for this balance? Thank you
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Tom from SWISCO responded:

Hello! This looks like a pretty typical spiral balance for a tilt window. You could have either our 9/16" diameter S600-17 or 3/8" diameter S900-17, depending on the diameter of the outer tube. 

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 choose the proper spiral balance tip color
How to choose the proper spiral balance tip color
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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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