Weather shield non tilt balance

A quick learner from Wisconsin says:
Looking for a replacement for this balance. Doesn't need to be exact, I can replace the pair and sash guides if needed.
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Bob from SWISCO responded:

This might be our S350-21 Channel Balance. Look over all the dimensions and specifications to ensure it matches up. Your stamp code of 20D should conform to our stamp option of 2040, which will support a window sash in the weight range of 15 through 23 lbs. 

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