Coil Balance Spring

A quick learner from New Jersey says:
my window is 24 X 29 inches double glass can you please tell me which size coil do I need, every time I buy this product it breaks after 1 year
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Paul from SWISCO responded:
Our S190-832 may be a good match for your window. What numbers are printed on your current coil springs, though? That might be a better way to determine a replacement.
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