3/8 spiral tilt window balances

A home owner from Woburn, MA says:
March 23, 2015
Hey guys, I just ordered 6- S900-25 spiral tilt window balances from you. I just noticed they should be 5/8. Will they still work if I install both of them? or should I return them and order the 5/8?
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Tom from SWISCO responded:
March 23, 2015
No, I do not believe an S900-25 balance can work in place of an S600-25. I recommend returning the ones you received and purchasing new S600-25 balances.
25" Series 600 Spiral Tilt Window Balance
25" Series 600 Spiral Tilt Window Balance
S600-25
$8.95
25" Series 900 Spiral Balance
25" Series 900 Spiral Balance
S900-25
$8.70
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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