Balance identification

A home owner from Danville says:
I am trying to replace several balances on my windows. I believe I need the 385 series (definately a 1905 top and went with bottom was a little past 1inch so thought 385 instead of 380)but am unsure of stamp option because there is no stamp on my current balance. I have two sizes of windows. one is 20lbs and measures 39 1/2-29 and the second is 18lbs and measures 293/4 -331/2. Do I get the 2530 for the 18 lbs? and the 2540 for the 20lbs? If it doesn't work can I exchange balance for right one.
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Paul from SWISCO responded:
Thanks for contacting us. I agree with your choices. For the 18 pound sash, I would use the 2530 option, while for the 20 pound sash I would use the 2540. For future reference, we have a chart on each channel balance store page that shows how much weight each option can support. That's all you need to reference to determine what option you need. We do have a return policy, which you can see here.
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