29" 380 Replacement Channel Balances

A quick learner from Sanford, Florida says:
I have removed both block and tackle balances and I can find no stamps for load ratings. How do I specify that when ordering replacements from Swisco?
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Tom from SWISCO responded:
If your balances do not have any stamps on them, you will need to weigh your sash on a scale and refer to the chart we show on the S380-29 store page.
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