window balance 17-C-30

A quick learner from canada says:
Hi there , pls help me to find the right replacement balance , the mark on the broken one is UNIQUE 17-C-30 , and it is 18" long. ths so much
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting! Please take a look at our S350-18 channel balance and compare it to your own hardware. Does this look about right? I'd also recommend the 1730 stamp option. This can carry a window sash weight of 12 to 14 pounds. Weigh your window sash and confirm that its weight falls within that range.
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