Coil spring balance

A quick learner from Massachusetts says:
Hi!My coil spring was broken, so I looking the replacement for the coil balance, but I can't see any number shown on the spring and no weights on the window, I weight my window like 10 lbs. So, I should oder the S190-540? Or S190-940 for both sides?

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Paul from SWISCO responded:

Thank you for posting. For your coil balance shoe, our 15-180 looks like a good fit. Take a closer look and see if you agree. For the coil spring, our S190-540 will work for a 10 pound sash.

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