Replacement Window Channel Balance 16" metal length, 1/2" (actual 9/16") channel width, 1540 BSL M3

A quick learner from United States says:
Dear Sir/Ma?am, I need to order two of the Subject window channel balances, (completely assembled.) Please let me know if you have available and costs, etc. Thank you kindly!
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Paul from SWISCO responded:

Hello,

It looks like you'll need our S350-16 channel balance. Please compare the channel length and the nylon balance ends to make sure that this will make a good replacement for you. Based on your stamp, you'll need a 1540 spring weight option. 

Thank you.

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