Coil spring balance

A quick learner from Massachusetts says:
August 11, 2019
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?

Thanks
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Paul from SWISCO responded:
August 15, 2019

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.
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
540 S190 Coil Balance Spring
540 S190 Coil Balance Spring
S190-540
$9.74
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