3/8 spiral tilt window balances

A home owner from Woburn, MA says:
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:
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.
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