Coiled Spring Window balance and track for vinyl replacement windows

A quick learner from Cranford, NJ says:
November 28, 2018
Spring is stamped with either a 6 or 9. Guessing that refers to the strength of the spring. Looking to replace both on a window where one of the bottom locking portion of the unit broke or separated from the spring unit above it.
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Paul from SWISCO responded:
December 3, 2018

Greetings -

Unfortunately, we don't have your exact balance system. We have a 1/2" wide coil spring, Series 160 that hooks on to 15-199 pivot shoe instead of screwing it on. The coil spring weight will be 9 lbs., so you would order S160-9. Let us know what you think.
9 lbs Series 160 Coil Balance
9 lbs Series 160 Coil Balance
S160-09
$5.48
Pivot Shoe, 17/32" Thick
Pivot Shoe, 17/32" Thick
15-199
$3.70
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