Channel Balance

A contractor from Raleigh, NC says:
We're trying to match a balance that has 3564 stamped on it. I can find 3560, will this part be adequate for replacement of the existing? It is for a non tilt window and a 1/2" balance. Your help is appreciated.
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Bob from SWISCO responded:

Thanks for posting. That stamp code is unfamiliar to us; it may be from an older rating system. The best thing to do is to weigh your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the product page.

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