spring for 32 x 16.5 window

A quick learner from Macungie pa says:
Window sash is 32 x 16.5 and weighs 13.6 lbs.
There is one spring on each side is the sash.
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Paul from SWISCO responded:

Based on your photo and sash weight, I think you could use our S150-7 coil spring. You may want to remove your old coil spring and check to make sure the Series 150 is a match, and that you have some kind of #7 marking on the spring.

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