Window channel replacement

A home owner from DeFuniak Springs, FL says:
I need to order two window channels, 27 in., #S795-27, and do not understand the Options. The "Cart" will not accept my request.
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Paul from SWISCO responded:
Hey, Larry. The stamp option is important. You should be able to match it up to the stamp printed on your existing balance, but if you are unable to then you will need to weigh your sash and refer to the chart we show on the S795-27 store page.
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