CertainTeed balance springs

A quick learner from USA says:
What product would you recommend to replace the following? The number on the spring looks like 9.0 or 0.9, possibly 0.0 and is 1/2 inch, The sash is about 24 x 30
User submitted photo of their window hardware.
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Paul from SWISCO responded:
Please start by looking at our 15-191 pivot shoe and Series 160 coil spring. I believe these are the parts you're looking for. Your shoe is a little different from ours, but it may still be a good match.
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