Help with finding the correct fit.

A home owner from Orlando, FL says:
Good evening, I want to purchase new channel balance, I'm not sure which one is the right fit. I measured and it's 29". I attached pictures with some markings on my previous one. Thanks in advance.
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Bob from SWISCO responded:

I believe this is an S380-29 Channel Balance. Look over all the specifications listed to confirm. For a stamp option, I believe you should choose 2850, which means the balances will support a sash in the weight range of 28 through 32 pounds. 

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