S152 coils for an 18 lbs. window

A home owner from Buffalo, NY says:
Need both coil balance springs for my window, ( S-152 )Cannot detect any numbers or letters on either one. The window weighs 18 Lbs. I assume the 9# coils will work? Thank you.
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Casey from SWISCO responded:


I agree that as long as your original coil springs are an exact match to the S152 and your sash weighs exactly 18-pounds, then one S152-9 on each side of the window would provide the correct amount of strength. Thanks for posting! 

How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
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